Check in Android gen files and configure Android src roots in Maven

git-svn-id: http://zxing.googlecode.com/svn/trunk@3004 59b500cc-1b3d-0410-9834-0bbf25fbcc57
Update versions of plugins, dependencies

git-svn-id: http://zxing.googlecode.com/svn/trunk@3005 59b500cc-1b3d-0410-9834-0bbf25fbcc57