Added the shared overlord header to the gadget server.
Removed all login and signup features from the gadget server.  Now 
using JAAS for authentication instead - with lazy creation of the
user row in the DB.
The gadget-web project now participates in Overlord SSO by default
(configured for JBoss AS 7.1) and working with the latest
overlord-commons.
Minor configuration changes.
- Bumped the overlord commons version.
- Support system properties in bootstrap (db config)
Merge pull request #6 from EricWittmann/overlord-sso-2013-05-20

Added Overlord SSO support/config to gadget server