Adding book metadata to doc head, fix tabs for content build, fix for reference page double footer.
am: e4a8ab1

* commit 'e4a8ab1a445a38a7b316513b1eac300d41eb49f7':
  Adding book metadata to doc head, fix tabs for content build, fix for reference page double footer.

Change-Id: I802ba805da249294433b5e1cc0a9563df1a1cdd4