Squashed 'xface-extension-calendar/' changes from 8f1e51d..911e378

911e378 Update .reviewboardrc
de3fae9 Update README.md

git-subtree-dir: xface-extension-calendar
git-subtree-split: 911e378965d0468a1472c7f300d69304f6b2322b
Merge commit '7dbaa63e0491b5334a975dd94c9375ba7a35dacf'