Squashed '.themes/octostrap3/' changes from 9198ac5..6ee75db

6ee75db Display the post date, fix #34 and fix #36
7ac1c0e use the null layout to avoid warning while `rake generate'

git-subtree-dir: .themes/octostrap3
git-subtree-split: 6ee75db3c3e742958c5c4ef529ebb755afb7ad38
Merge commit 'ac84d22c2109ca8c1fe5712e8b3497892f198a93' into source