Don't automatically build after installing plugins

This should be done manually by user
Move android-orientation script to after_build hook

'cordova build android' re-writes the Android Manifest each
time, so the adjustment was getting clobbered.
Add script to automatically adjust Android target API to 4.1 Jelly Bean

Android Jelly Bean 4.1 is API 16, from this doc:
http://developer.android.com/guide/topics/manifest/uses-sdk-element.html

config.xml is also updated for consistency, but this does nothing
at all in Cordova...
Merge branch 'refs/heads/master' into african-lions