The gitignore ** pattern is not supported by git until version 1.8.2.

CentOS 6 uses 1.7.1, Ubuntu 12.04 LTS uses 1.7.9.

https://github.com/git/git/blob/master/Documentation/RelNotes/1.8.2.txt
Merge pull request #1656 from GawainLynch/hotfix/gitignore

The gitignore ** pattern is not supported by git until version 1.8.2.
Better defaults for content that has no Title or contents.
Updated CKeditor to 4.4.4.
Updated Select2 to 3.5.1
Updated Underscore to 1.7.0
Updated Modernizr to 2.8.2
Bob needs to learn how to HTML.
Prevent some "strict" errors. Fixes #1660.
Don't hydrate for previous and next.
Added "no hydrate" option for {% setcontent %}
Added two nohydrate params in templates.
Skipped some unneeded hydration..
Fixing a ton of small quirks in async / CKeditor file browser
Typo.