Custom data page + Permissions + Caching

-Upgraded Stormpath SDK dependency to latest stable release of 0.9.2
-Upgraded Spring Security Stormpath plugin to latest stable release of 0.2.0
-Added page to view and edit account's CustomData
-Added Permissions example. It is now possible to use Spring Security Granted Authorities as permissions.
-Stormpath SDK now has a Spring cache configured: a simple JDK ConcurrentMap