Added a step to the ES6 recipe to make sure we don't have JS fiels duplicated. Also made steps clearer by switching to DIFF syntax for code blocks
Added a step to the ES6 recipe to make sure we don't have JS fiels duplicated.
Also made steps clearer by switching to DIFF syntax for code blocks

Fixes #392

trendystore/store,flaiker/polymer-starter-kit,victorgb6/id-questionary,abdonrd/polymer-starter-kit,klarkc/polymer-loopback-starter-kit,Negashev/negash.ru,Ex-ante-Labs/pivot-ahead,plusCubed/pluscubed-site,proplanr/polymer-starter-kit,Jelle-imitto/tools-polymer,michaetto/f16,klarkc/polymer-loopback-starter-kit,Jelle-imitto/tools-polymer,gertcuykens/polymer-starter-kit,anthonybrown/polymer-starter-kit,StartPolymer/polymer-starter-kit,RoyKoh/Project-3,markovuksanovic/polymer-starter-kit,stephenzsy/charon-frontend,trendystore/store,StartPolymer/polymer-starter-kit-plus,TheFinestArtist/HandbellChoir-Web,lordoftheflies/mlm-portal,SB-Technology-Holdings-International/Water,JnJSW/dttdata,SB-Technology-Holdings-International/WateringWebClient,andrefuller/PolymerTrailerViewer,LM450N/polymer-starter-kit,mtusk/polymer-starter-kit,jdavidagudelo/polymerstarter,alexpaluzzi/polymer-starter-kit,LM450N/polymer-starter-kit,semafloor/semafloor-test-alpha,LM450N/polymer-starter-kit,victorgb6/id-questionary,FaellCarvalho/Geo-Location,SB-Technology-Holdings-International/Water,Serious-Rage/poligomy,gick/mobile-polymer-starter-2,flaiker/polymer-starter-kit,grebett/polymer-starter-kit,andrefuller/PolymerTrailerViewer,gertcuykens/polymer-starter-kit,tecla5/site,SB-Technology-Holdings-International/WateringWebClient,dennisg/luminis-colleagues,VandeurenGlenn/web-import,mtusk/polymer-starter-kit,SB-Technology-Holdings-International/Water,egohub/appdesign,Sykkro/penny-web,michaetto/f16,proplanr/polymer-starter-kit,gianluka79/First,tecla5/site,Jelle-imitto/tools-polymer,markovuksanovic/polymer-starter-kit,Negashev/negash.ru,Negashev/negash.ru,gick/reveries-project,hourliert/polymer-starter-kit,stefanoantonel/brainpower,JnJSW/dttdata,robdodson/polymer-starter-kit,proplanr/polymer-starter-kit,klarkc/polymer-loopback-starter-kit,FaellCarvalho/Geo-Location,JnJSW/dttdata,lordoftheflies/mlm-portal,Ex-ante-Labs/pivot-ahead,gertcuykens/polymer-starter-kit,elenadatsiuk/tinkersolomid,jeffposnick/polymer-starter-kit,SB-Technology-Holdings-International/WateringWebClient,trendystore/store,Serious-Rage/poligomy,alexpaluzzi/polymer-starter-kit,Sykkro/penny-web,Ex-ante-Labs/shopper.ninja,SB-Technology-Holdings-International/Water,hourliert/polymer-starter-kit,felixzapata/polymer-starter-kit,ragingwind/polymer-starter-kit,gianluka79/First,Ex-ante-Labs/shopper.ninja,RoyKoh/Project-3,andrefuller/PolymerTrailerViewer,anthonybrown/polymer-starter-kit,FaellCarvalho/Geo-Location,StartPolymer/polymer-starter-kit,1001genomes/admixture-map,felixzapata/polymer-starter-kit,ragingwind/polymer-starter-kit,grebett/polymer-starter-kit,lordoftheflies/mlm-portal,Sykkro/penny-web,gick/reveries-project,Jelle-imitto/tools-polymer,natabbotts/blogs.org.uk,stefanoantonel/ecofit,egohub/appdesign,stefanoantonel/ecofit,RoyKoh/Project-3,gick/reveries-project,elenadatsiuk/tinkersolomid,StartPolymer/polymer-starter-kit-plus,abdonrd/polymer-starter-kit,stephenzsy/charon-frontend,felixzapata/polymer-starter-kit,semafloor/semafloor-test-alpha,semafloor/semafloor-test-alpha,bdnorg/tmi,robdodson/polymer-starter-kit,victorgb6/id-questionary,SB-Technology-Holdings-International/WateringWebClient,markovuksanovic/polymer-starter-kit,Jelle-imitto/tools-polymer,1001genomes/admixture-map,grebett/polymer-starter-kit,stephenzsy/charon-frontend,Serious-Rage/poligomy,michaetto/f16,VandeurenGlenn/web-import,dennisg/luminis-colleagues,stefanoantonel/brainpower,alexpaluzzi/polymer-starter-kit,gick/mobile-polymer-starter-2,stefanoantonel/ecofit,ragingwind/polymer-starter-kit,gick/mobile-polymer-starter-2,jeffposnick/polymer-starter-kit,gianluka79/First,jdavidagudelo/polymerstarter,bdnorg/tmi,natabbotts/blogs.org.uk,SB-Technology-Holdings-International/Water,plusCubed/pluscubed-site,TheFinestArtist/HandbellChoir-Web