adding pressforward by PressForward

git-svn-id: http://plugins.svn.wordpress.org/pressforward/trunk@889649 b8457f37-d9ea-0310-8a92-e5e31aec5664
Merge pull request #295 from PressForward/3.1.x

Merge for the last bugfixes of 3.1.x
Update to readme for deployment to WordPress.org
Updating contributors
Merge branch 'master' of github.com:pressforward/pressforward
Merge branch 'master' of github.com:pressforward/pressforward
Merge branch 'master' of github.com:pressforward/pressforward
Update readme.txt for WordPress directory.
fixing author list
Update readme.md

adding Sloan Foundation
Merge pull request #298 from PressForward/master

Prepping bugfix branch.