Boldly move to Java 7 for everything, including Android.

git-svn-id: https://zxing.googlecode.com/svn/trunk@2981 59b500cc-1b3d-0410-9834-0bbf25fbcc57
Bump to BS 4.5.2

git-svn-id: https://zxing.googlecode.com/svn/trunk@2982 59b500cc-1b3d-0410-9834-0bbf25fbcc57