fix(draggable.ts): Use toRx() of EventEmitter
fix(draggable.ts): Use toRx() of EventEmitter

Use public method toRx() of EventEmitter insted of _subject.
davidstellini/bvl-pay,JerrolKrause/angular-seed-complete,stepkraft/factory-queue,juristr/angular2-webpack-starter,un33k/angular2-webpack-starter,airbnbbkk/airbnbbkk.github.io,zm1994/gallery,HipsterZipster/angular2-webpack-starter,Neverbalnost/angular2,imdeakin/yunxi-admin,phammans/angular-2,dweitz43/angular2-webpack-starter,6Kbrouette/POEC_TP,ancor-dev/chronology-client,AngularClass/angular2-webpack-starter,Draccoz/zalamo-starter,silbermm/silbersoft.io,dimkk/cccfix,Niaro/trood-demo,mitchellcmurphy/touristBingo,liveweird/gossip-ng2,roski/devroks,viktorianheathen/hillel,krimple/angular2-webpack-demo-routing-and-http,6Kbrouette/POEC_TP,CarmenRosas/TestPortal,SmallGress/learn-ng2,nasiUduk/qi-project-test,ng2-dev/angular-quick-starter,dotcs/angular2-webpack-starter,paynoattn/ng2-weather-app,24hours/vinegar,chriscurnow/angular2-webpack-starter,Niaro/trood-demo,colinskow/angular-electron-dream-starter,spawnius/angular2-webpack-starter,ng2-dev/angular-quick-starter,SmallGress/learn-ng2,jffjs/hs-deckbuilder,remakeelectric/etactica-frontend,benjaminleetmaa/hsOemV3,donkebap/habicht-app,interlocal/deadhome,downeyfe/angular2-webpack-starter,sebastianhaas/medical-appointment-scheduling,peternguyen88/gmat-zeth,s-robertson/things-angular,timmyg/mary-tim-wedding-webapp,remakeelectric/etactica-frontend,jimitndiaye/ionic2test,redaikidoka/SistemaE3,dlevkov/TenTvFront,ExchangeEffect/ExchangeEffect.github.io,abhilash-shrivastava/Meet-the-Need-v2,Nighthawk14/angular2-webpack-starter,jsec516/ng2-location-tracker,abhilash-shrivastava/Meet-the-Need-v2,swga/website,iSystemPlus/ng2-webpack-play,iSystemPlus/ng2-webpack-play,inchingorg/xdata-web,phucps89/angular2-starter-webpack,jelluz/pimatic-angular2-frontend,DmitriyLamzin/angular2_try,ancor-dev/chronology-client,prasadc82/GitGames,Milan03/stefan-site,SekibOmazic/angular2-webpack-starter,colinskow/angular-electron-dream-starter,russellf9/ng-2-webpack-playground,Michaelzvu/ArounSee,CarmenRosas/TestPortal,louisscruz/freedom-mortgage,jffjs/hs-deckbuilder,kovalevmax/ang2,milenkovic/lost-consulting,Atrosh/REPET-FRONT,abner/angular2-webpack-starter,24hours/vinegar,Atrosh/REPET-FRONT,abdulhaq-e/angular2-webpack-starter,HipsterZipster/angular2-webpack-starter,angular-class/angular2-webpack-starter,SekibOmazic/angular2-webpack-starter,CNSKnight/angular2-webpack-starter,DigitalGeek/angular2-webpack-starter,timathon/sgz010,egucciar/angular2-webpack-starter-primeng-working,s-robertson/things-angular,vjcspy/retail-cloud,jacobjojan/angular2-webpack-starter,dartavion/angular-planning-poker,agilethought/ObservableExample,donkebap/habicht-app,interlocal/deadhome,shekhra400/wheather-report-app,chriscurnow/angular2-webpack-starter,dimkk/cccfix,joachimprinzbach/ng2-camp,roski/devroks,JonnyBGod/angular2-webpack-advance-starter,interlocal/deadhome,benjaminleetmaa/hsOemV3,kovalevmax/ang2,davidstellini/bvl-pay,dsebastien/angularjs-webpack-starter,nasiUduk/qi-project-test,JamesUlph/angular2-webpack-starter,browseros/browser,Luchillo/Ng2-Pro-webpack-starter,wishtack/wt-angular2-boilerplate,dlevkov/TenTvFront,websublime/kong-console,bave8672/angular2-finder,wohugb/d3f,Aggelost1/moviefinder,benjaminleetmaa/oemRepo,angular-class/angular2-webpack-starter,Ta-Moon-A/ng-webpack-starter,psamit/angular-starter,dreamer99x/ceb,benjaminleetmaa/hsoemRepo,zdenkotudor/eli,Draccoz/zalamo-starter,milenkovic/lost-consulting,dartavion/angular-planning-poker,s-robertson/things-angular,zm1994/gallery,24hours/vinegar,imdeakin/yunxi-admin,MinxianLi/angular2-webpack-starter,timathon/sgz010,Gabriel0402/angular2-webpack-starter,dl988/quedro,shortgiraffe4/angular2,dweitz43/angular2-webpack-starter,bave8672/angular2-finder,lorenlew/PuzzleGame,paynoattn/ng2-weather-app,browseros/browser,airbnbbkk/airbnbbkk.github.io,bave8672/angular2-finder,ancor-dev/chronology-client,wishtack/wt-angular2-boilerplate,Baqend/angular-starter,San4oPanso/angular2-webpack-starter,shortgiraffe4/angular2,JamesUlph/angular2-webpack-starter,StefH/angular2-webpack-starter,jiverson/angular2-webpack-starter,Yaroslav-Andryushchenkov/epam-angular2,jiverson/angular2-webpack-starter,ForsetiSWE/VigiFlow,remakeelectric/etactica-frontend,jsec516/ng2-location-tracker,jeffplourd/jeffplourd,ng2-developers/angular2-webpack-starter,thecortex/angular2-webpack-starter,olegskIT/ng2-transfer,SmallGress/learn-ng2,artfoundry/billing,miedziana/angular2-webpack-starter,jhuntoo/angular2-webpack-starter,peternguyen88/gmat-zeth,Draccoz/zalamo-starter,Tribilik/Pictu-r,PavelVak/sell-it,phucps89/angular2-starter-webpack,Tribilik/Pictu-r,miedziana/angular2-webpack-starter,Luchillo/Ng2-Pro-webpack-starter,KubaJastrz/angular-password-generator,Nebulis/angular2-firebase,abhilash-shrivastava/Meet-the-Need-v2,mitchellcmurphy/touristBingo,adrhc/angular2-webpack-starter,wishtack/wt-training-angular2,imdeakin/yunxi-admin,spawnius/angular2-webpack-starter,abdulhaq-e/angular2-webpack-starter,Alex-Barbier/angular2,peternguyen88/gmat-zeth,ShadowMinhja/materialize-angular2,olegskIT/ng2-transfer,AngularClass/angular-starter,lohiarahul/angular-sub-starter,abdulhaq-e/angular2-webpack-starter,milenkovic/lost-consulting,paynoattn/ng2-weather-app,Luchillo/Ng2-Pro-webpack-starter,KubaJastrz/angular-password-generator,chriscurnow/angular2-webpack-starter,psamit/angular-starter,swga/website,arun-nyllabs/angularAlpha,zishe/angular2-finances,ForsetiSWE/VigiFlow,forty-two-labs/angular2-webpack-starter,phucps89/angular2-starter-webpack,jhuntoo/angular2-webpack-starter,lohiarahul/angular-sub-starter,lorenlew/PuzzleGame,dartavion/angular-planning-poker,humphreymburu/FutureSteps,team-playalong/playalong-angular2,Luchillo/Luchillo-tech-showcase,wohugb/d3f,anthonybrown/angular2-webpack-starter,team-playalong/playalong-angular2,dimkk/cccfix,Aggelost1/moviefinder,ShadowMinhja/materialize-angular2,dreamer99x/ceb,benjaminleetmaa/oemRepo,Neverbalnost/angular2,mdarif-k/angular2-webpack,juristr/angular2-webpack-starter,Tribilik/Pictu-r,louisscruz/freedom-mortgage,jsec516/ng2-location-tracker,NathanWalker/angular2-webpack-starter,Nebulis/angular2-firebase,DmitriyLamzin/angular2_try,Luchillo/Luchillo-tech-showcase,JonnyBGod/angular2-webpack-advance-starter,DigitalGeek/angular2-webpack-starter,redaikidoka/SistemaE3,websublime/kong-console,team-playalong/playalong-angular2,spawnius/angular2-webpack-starter,egucciar/angular2-webpack-starter-primeng-working,CNSKnight/angular2-webpack-starter,wiikviz/webpack-angular2-bs4-sass,jeaber/frontierproperties,Nighthawk14/angular2-webpack-starter,phammans/angular-2,marta-tatiana/angular2-webpack-starter,bryant-pham/easyjudge,agilethought/ObservableExample,thecortex/angular2-webpack-starter,arun-nyllabs/angularAlpha,itoufo/stoq-web2,dl988/quedro,juristr/angular2-webpack-starter,StefH/angular2-webpack-starter,benjaminleetmaa/hsoemRepo,zishe/angular2-finances,viktorianheathen/hillel,San4oPanso/angular2-webpack-starter,redaikidoka/SistemaE3,specialstandard/stockchartguru,timmyg/mary-tim-wedding-webapp,liveweird/gossip-ng2,MinxianLi/angular2-webpack-starter,AngularClass/angular2-webpack-starter,nasiUduk/qi-project-test,tellurS/op,dlevkov/TenTvFinal,rwaldvogel/angular2-rabbitmq,websublime/kong-console,Milan03/stefan-site,nijk/hat-selector,mitchellcmurphy/filterFunctions,louisscruz/freedom-mortgage,dreamer99x/ceb,benjaminleetmaa/hsoemRepo,wishtack/wt-training-angular2,iSystemPlus/ng2-webpack-play,manuelhuber/LostColonies,HipsterZipster/angular2-webpack-starter,Michaelzvu/ArounSee,airbnbbkk/airbnbbkk.github.io,donkebap/habicht-app,StefH/angular2-webpack-starter,wishtack/wt-angular2-boilerplate,inchingorg/xdata-web,nijk/hat-selector,AngularClass/angular-starter,Baqend/angular2-starter,Alex-Barbier/angular2,louisscruz/freedom-mortgage,zxqian1991/angular2-build,shekhra400/wheather-report-app,AngularClass/angular-starter,russellf9/ng-2-webpack-playground,dweitz43/angular2-webpack-starter,tb/angular2-reactive-examples,tb/angular2-reactive-examples,wiikviz/webpack-angular2-bs4-sass,wiikviz/webpack-angular2-bs4-sass,JamesUlph/angular2-webpack-starter,miedziana/angular2-webpack-starter,shortgiraffe4/angular2,jiverson/angular2-webpack-starter,Atrosh/REPET-FRONT,stepkraft/factory-queue,viktorianheathen/hillel,un33k/angular2-webpack-starter,Baqend/angular2-starter,dlevkov/TenTvFront,jacobjojan/angular2-webpack-starter,serenity-frontstack/angular-component-seed,PavelVak/sell-it,joachimprinzbach/ng2-camp,kovalevmax/ang2,dsebastien/angularjs-webpack-starter,mitchellcmurphy/filterFunctions,agilethought/ObservableExample,agilethought/ObservableExample,jhuntoo/angular2-webpack-starter,jacobjojan/angular2-webpack-starter,shekhra400/wheather-report-app,dlevkov/TenTvFinal,jimitndiaye/ionic2test,rwaldvogel/angular2-rabbitmq,benjaminleetmaa/oemRepo,dsebastien/angularjs-webpack-starter,cherurg/audaily,vamurov/lazyImageLoad,San4oPanso/angular2-webpack-starter,carathorys/TestRepo,carathorys/TestRepo,Gabriel0402/angular2-webpack-starter,sebastianhaas/medical-appointment-scheduling,psamit/angular-starter,dotcs/angular2-webpack-starter,jeaber/frontierproperties,angular-class/angular2-webpack-starter,adrhc/angular2-webpack-starter,shattar/test-ng2-submodule-routing,downeyfe/angular2-webpack-starter,ExchangeEffect/ExchangeEffect.github.io,Neverbalnost/angular2,swga/website,dotcs/angular2-webpack-starter,egucciar/angular2-webpack-starter-primeng-working,stepkraft/factory-queue,zdenkotudor/eli,Michaelzvu/ArounSee,cherurg/audaily,benjaminleetmaa/hsOemV3,marta-tatiana/angular2-webpack-starter,chriscurnow/angular2-webpack-starter,dl988/quedro,ronencamera/clientv2,6Kbrouette/POEC_TP,refaelgold/angular2-webpack-starter,nijk/hat-selector,joachimprinzbach/ng2-camp,itoufo/stoq-web2,timathon/sgz010,olegskIT/ng2-transfer,PavelVak/sell-it,jimitndiaye/ionic2test,adrhc/angular2-webpack-starter,Gabriel0402/angular2-webpack-starter,Ta-Moon-A/ng-webpack-starter,serenity-frontstack/angular-component-seed,CNSKnight/angular2-webpack-starter,artfoundry/billing,ng2-developers/angular2-webpack-starter,mdarif-k/angular2-webpack,wishtack/wt-training-angular2,forty-two-labs/angular2-webpack-starter,JerrolKrause/angular-ultimate-starter,ExchangeEffect/ExchangeEffect.github.io,forty-two-labs/angular2-webpack-starter,Milan03/stefan-site,krimple/angular2-webpack-demo-routing-and-http,Nighthawk14/angular2-webpack-starter,NathanWalker/angular2-webpack-starter,ronencamera/clientv2,abner/angular2-webpack-starter,cherurg/audaily,vamurov/lazyImageLoad,Baqend/angular-starter,silbermm/silbersoft.io,JerrolKrause/angular-ultimate-starter,zishe/angular2-finances,krimple/angular2-webpack-demo-routing-and-http,jelluz/pimatic-angular2-frontend,mitchellcmurphy/filterFunctions,ronencamera/clientv2,browseros/browser,Nebulis/angular2-firebase,mdarif-k/angular2-webpack,carathorys/TestRepo,jelluz/pimatic-angular2-frontend,SekibOmazic/angular2-webpack-starter,JerrolKrause/angular-seed-complete,specialstandard/stockchartguru,shattar/test-ng2-submodule-routing,ShadowMinhja/materialize-angular2,colinskow/angular-electron-dream-starter,abner/angular2-webpack-starter,Aggelost1/moviefinder,tb/angular2-reactive-examples,zm1994/gallery,russellf9/ng-2-webpack-playground,Ta-Moon-A/ng-webpack-starter,JonnyBGod/angular2-webpack-advance-starter,wohugb/d3f,manuelhuber/LostColonies,Alex-Barbier/angular2,jeffplourd/jeffplourd,zdenkotudor/eli,Luchillo/Luchillo-tech-showcase,phammans/angular-2,tellurS/op,ng2-developers/angular2-webpack-starter,humphreymburu/FutureSteps,silbermm/silbersoft.io,joachimprinzbach/ng2-camp,vjcspy/retail-cloud,JerrolKrause/angular-seed-complete,MinxianLi/angular2-webpack-starter,ForsetiSWE/VigiFlow,zxqian1991/angular2-build,KubaJastrz/angular-password-generator,Yaroslav-Andryushchenkov/epam-angular2,marta-tatiana/angular2-webpack-starter,thecortex/angular2-webpack-starter,refaelgold/angular2-webpack-starter,tellurS/op,timmyg/mary-tim-wedding-webapp,lorenlew/PuzzleGame,AngularClass/angular2-webpack-starter,arun-nyllabs/angularAlpha,zishe/angular2-finances,sebastianhaas/medical-appointment-scheduling,vjcspy/retail-cloud,zxqian1991/angular2-build,manuelhuber/LostColonies,bryant-pham/easyjudge,jffjs/hs-deckbuilder,inchingorg/xdata-web,lohiarahul/angular-sub-starter,milenkovic/lost-consulting,shattar/test-ng2-submodule-routing,liveweird/gossip-ng2,vamurov/lazyImageLoad,jeffplourd/jeffplourd,redaikidoka/SistemaE3,DigitalGeek/angular2-webpack-starter,bave8672/angular2-finder,DmitriyLamzin/angular2_try,NathanWalker/angular2-webpack-starter,davidstellini/bvl-pay,roski/devroks,Niaro/trood-demo,JerrolKrause/angular-ultimate-starter,prasadc82/GitGames,rwaldvogel/angular2-rabbitmq,dlevkov/TenTvFinal,zxqian1991/angular2-build,CarmenRosas/TestPortal,jeaber/frontierproperties,un33k/angular2-webpack-starter,downeyfe/angular2-webpack-starter,bryant-pham/easyjudge,serenity-frontstack/angular-component-seed,s-robertson/things-angular,humphreymburu/FutureSteps,anthonybrown/angular2-webpack-starter,sebastianhaas/medical-appointment-scheduling,anthonybrown/angular2-webpack-starter,specialstandard/stockchartguru,ng2-dev/angular-quick-starter,artfoundry/billing,Yaroslav-Andryushchenkov/epam-angular2,itoufo/stoq-web2,Baqend/angular-starter,prasadc82/GitGames,refaelgold/angular2-webpack-starter,Baqend/angular2-starter,mitchellcmurphy/touristBingo,adrhc/angular2-webpack-starter,itoufo/stoq-web2