Checks if mainpage alredy exist. Warns, when user wants to delete screen
Merge branch 'master' of https://github.com/a71993/AngularProtoypeEngine

Conflicts:
	protoAngular/client/screen/screen.js
	protoAngular/server/UIScreen/UIScreen_routes.js
Merge branch 'master' of https://github.com/a71993/AngularProtoypeEngine
Changes <include='componentName'> to componenthtml in screen.
Merge branch 'master' of https://github.com/a71993/AngularProtoypeEngine