Explicitly set babel-core and node-libs-browser
Explicitly set babel-core and node-libs-browser

```babel-core``` is required by ```babel-loader``` and its size is ~19 MB.
```node-libs-browser``` is required by ```webpack``` and its size is ~3MB.
If we explicitly define it as dev deps - it won't be copied to the release. As the result, the release will have ~23 MB less size, which is about 20%.
okmttdhr/pull-request-templates,yesmeck/hotelbar,ycai2/visual-git-stats,nefa/eletrcon-react-redux,eranimo/explorer,UniSiegenCSCW/remotino,xuandeng/base_app,nickbytes/scrtchpd,treyhuffine/tuchbase,tw00089923/kcr_bom,nantaphop/redd,kivo360/ECC-GUI,blockstack/blockstack-portal,swiecki/strigine,Sebkasanzew/Electroweb,lhache/katalogz,TheCbac/MICA-Desktop,kRITZCREEK/psc-gui-redux,carly-lee/electron-sleep-timer,pahund/scenescreen,zackhall/ack-chat,Producters/electron-react-boilerplate,riccardopiola/LeagueFlash,xREDk/electron-react-boilerplate,kme211/srt-maker,irwinb/table-viewer,tw00089923/kcr_bom,joshuef/peruse,blockstack/blockstack-portal,foysalit/runkeeper-desktop,waha3/Electron-NeteaseCloudMusic,rtorr/electron-react-boilerplate,swiecki/strigine,BooneTeam/ReactElectronApp,hardchor/timesheets,hsin421/ElectronReactDemo,TriPSs/popcorn-time-desktop,jaketrent/photo-surf,nefa/eletrcon-react-redux,defektive/photo-thing,SmartPowerSocket/DesktopApp,riccardopiola/LeagueFlash,Byte-Code/lm-digitalstore,xiplias/github-browser,Byte-Code/lm-digitalstore,li-cn/electron-react-boilerplate,stefanKuijers/aw-fullstack-app,TheCbac/MICA-Desktop,aboubacartoure93/ElectronReactDemo,lhache/katalogz,Andrew-Hird/bFM-desktop,linuxing3/electron-react,Sebkasanzew/Electroweb,anthonyraymond/joal-desktop,baublet/lagniappe,mitchconquer/electron_cards,blockstack/blockstack-browser,surrealroad/electron-react-boilerplate,rike422/minesweeper,barbalex/kapla3,blockstack/blockstack-browser,cosio55/app-informacion-bitso,jenyckee/electron-virtual-midi,werm/electron-react-boilerplate,kabbi/nodepad,foysalit/wallly-electron,jaytrepka/kryci-jmena,alecholmez/crew-electron,joshuef/peruse,eranimo/explorer,hsin421/ElectronReactDemo,zackhall/ack-chat,xiplias/github-browser,hardchor/timesheets,okmttdhr/pull-request-templates,BooneTeam/ReactElectronApp,Producters/electron-react-boilerplate,ycai2/visual-git-stats,leofle/electron_manifesto,ACalix/sprinthub,runandrew/memoriae,kimurakenshi/caravanas,SmartPowerSocket/DesktopApp,Thecontrarian/bmux,SmartPowerSocket/DesktopApp,treyhuffine/tuchbase,pahund/wer-hat-an-der-uhr-gedreht,irwinb/table-viewer,pahund/wer-hat-an-der-uhr-gedreht,opensprints/opensprints-electron,kimurakenshi/caravanas,chentsulin/electron-react-boilerplate,blockstack/blockstack-portal,gidich/votrient-kiosk,anthonyraymond/joal-desktop,surrealroad/electron-react-boilerplate,waha3/Electron-NeteaseCloudMusic,jaketrent/photo-surf,amilajack/popcorn-time-desktop,thirdicrypto/darkwallet-electron-ui,jhen0409/electron-react-boilerplate,bird-system/bs-label-convertor,tomv564/electron-git-buddy,UniSiegenCSCW/remotino,stefanKuijers/aw-fullstack-app,espenbjorkeng/Rabagast,ThomasBaldry/mould-maker-desktop,xREDk/electron-react-boilerplate,baublet/lagniappe,davegomez/electron-react-boilerplate,Thecontrarian/bmux,blockstack/blockstack-browser,ACalix/sprinthub,carly-lee/electron-sleep-timer,nantaphop/redd,LeeChSien/electron-react-boilerplate,JCombee/wallet,opensprints/opensprints-electron,chentsulin/electron-react-boilerplate,otissv/projectkit,knpwrs/electron-react-boilerplate,kaiyote/electron-elm-boilerplate,nickbytes/scrtchpd,cosio55/app-informacion-bitso,JoyceBabu/electron-react-boilerplate,espenbjorkeng/Rabagast,dfucci/Borrowr,TobiasBales/PlayuavOSDConfigurator,ThomasBaldry/mould-maker-desktop,dfucci/Borrowr,JoaoCnh/picto-pc,zedtux/grrn,blockstack/blockstack-portal,JoaoCnh/picto-pc,TobiasBales/PlayuavOSDConfigurator,oiledCode/electron-react-boilerplate,surrealroad/electron-react-boilerplate,kivo360/ECC-GUI,knpwrs/electron-react-boilerplate,sdlfj/eq-roll-tracker,TriPSs/popcorn-time-desktop,blockstack/blockstack-browser,robot-head/LaserDream,gearz-lab/gearz-ui,kaunio/gloso,davegomez/electron-react-boilerplate,zedtux/grrn,SmartPowerSocket/DesktopApp,LeeChSien/electron-react-boilerplate,ivtpz/brancher,cinderblock/XLN-Control,rike422/minesweeper,defektive/photo-thing,blockstack/blockstack-browser,gearz-lab/gearz-ui,foysalit/runkeeper-desktop,cinderblock/XLN-Control,pahund/scenescreen,Andrew-Hird/bFM-desktop,marciovicente/electron-react-boilerplate,oiledCode/electron-react-boilerplate,blockstack/blockstack-browser,werm/electron-react-boilerplate,robot-head/LaserDream,jaytrepka/kryci-jmena,jenyckee/electron-virtual-midi,runandrew/memoriae,sdlfj/eq-roll-tracker,kme211/srt-maker,yesmeck/hotelbar,otissv/projectkit,Byte-Code/lm-digital-store-private-test,linuxing3/electron-react,li-cn/electron-react-boilerplate,marciovicente/electron-react-boilerplate,UniSiegenCSCW/remotino,Byte-Code/lm-digital-store-private-test,thirdicrypto/darkwallet-electron-ui,bird-system/bs-label-convertor,yesmeck/hotelbar,mitchconquer/electron_cards,kabbi/nodepad,anthonyraymond/joal-desktop,xuandeng/base_app,eranimo/explorer,kRITZCREEK/psc-gui-redux,aboubacartoure93/ElectronReactDemo,kaunio/gloso,gidich/votrient-kiosk,barbalex/kapla3,blockstack/blockstack-portal,JCombee/wallet,kaiyote/electron-elm-boilerplate,amilajack/popcorn-time-desktop,JoyceBabu/electron-react-boilerplate,foysalit/wallly-electron,leofle/electron_manifesto,alecholmez/crew-electron,rtorr/electron-react-boilerplate,tomv564/electron-git-buddy,SmartPowerSocket/DesktopApp,jhen0409/electron-react-boilerplate,ivtpz/brancher