Delete redundant src folders that have been merged into Applications.
Merge branch 'master' into swimlane-merge

Conflicts:
	gallery/conf/routes
	gallery/test/GalleryControllerTest.scala
	section/conf/routes
	section/test/SectionControllerTest.scala
	section/test/SectionsControllerTest.scala
	section/test/TagControllerTest.scala
	video/conf/routes
	video/test/VideoControllerTest.scala
Merge pull request #1011 from guardian/swimlane-merge

Delete redundant src folders that have been merged into Applications.