Moved some files around for ADT support

Unfortunately ADT (after all _the_ editor for Android development) requires AndroidManifest.xml, res and assets to be in project root. Other parts can work with those files anywhere ( I've seen some projects that include separate resources dir, like htttps://github.com/tlazaro/scala-metagun ). I don't know about Idea IDE, but I think there will be no problem with this change (haven't tested it).

See http://code.google.com/p/android/issues/detail?id=24178 for reference.