Bump version to 2013.2.

Change-Id: I0eb60bb12a63e7ccf2623fb9aeaf9a9f84fda24e
Remove note on theming from release notes.

Change-Id: If7964f37eab3ada01d6efc8e6ec8d6f959d7151e
Merge "Bump version to 2013.2."