Changed to reflect the new picketlink version and picketbox latest changes.
Merge pull request #17 from pedroigor/master

See comments.
Changed the login and signup pages. Added JAX-RS endpoint to check username availability. code refactoring.
Small improvements.
Merge pull request #19 from pedroigor/master

Small improvements.
Removed unecessary resources.
Merge pull request #20 from pedroigor/master

Removed unnecessary resources.
Changed PicketBox dependency to 5.0.0-2012Nov26.
Merge pull request #21 from pedroigor/master

Changed PicketBox dependency to 5.0.0-2012Nov26
Updated to the latest PL IDM and PB version.
Merge pull request #23 from pedroigor/master

Updated to the latest PL IDM and PB version.
Changed to the latest PicketBox release version.
Merge pull request #24 from pedroigor/master

Changed to the latest PicketBox release version.