Squashed 'php/' changes from 083fd64..4a38782

4a38782 Open Atrium 2.15 - release notes http://drupal.org/node/2206043 and https://drupal.org/node/2205717

git-subtree-dir: php
git-subtree-split: 4a387827711200d2ad1f61ddbbffcdb6b3cffe9c
Merge commit 'ed4f2f263d2f108744058a8288f5e51ec4e6ad65'

Update to OpenAtrium v2.15.
One more redeploy.

Conflicts:
	README.md