CORE-6002: Refactor spring DI and security
    * Auth-related servlets are now using Spring DI. This allows us to be more specific with the properties that each class uses.
    * "belphegor/belphegor/logout" and other similar naming schemes have been corrected (see *-security.xml)
    * Began porting logging implementations to slf4j.
CORE-6002: removed the initialPage setting from CassSessionInitializationServlet
Merge pull request #7 from strootman/CORE-6002

CORE-6002: Refactor spring DI and security