DDF-551 Fixed delegate filter sorting, added security commons,

Updated platform delegate filter to sort received filter services.
Created security commons with http handling and properties loader.
Created platform util to hold osgi utilities.
Removed sorting from the handlers.
Updated SAML handler to use security common util.
DDF-551 Added utility classes to the platform.
DDF-551 Updated versions to 2.5.1-SNAPSHOT
DDF-551 Updated features file to include the new util bundle.
DDF-551 Fixed reference to the platform util bundle.
DDF-551 Updated to use bundle context with sorting.
DDF-551 Updated DelegateServlet filter logic to keep filters in highest service-ranking order.
DDF-551 Merged master into this branch in preparation to merge back.
DDF-551 Code cleanup from reviews.

Used maven dependency management for slf4j.
Updated platform app versions from merged code to match snapshot version.
Logged null user in CAS authentication handler.
Added SAML cookie constants to SecurityConstants - referenced them vs. local constants.
LoginFilter uses common SecurityConstants, checks for specific types before casting.
Removed transient from loggers.
Updated LoginFilter test to work properly with refactored code.
Updated anonymous handler test to check values in expected order.
Removed commented out code in main and test branches.
Removed dual licenses from various files.
DDF-551 Updated dependency management to include slf4j-simple
DDF-596: DDMS removal
DDF-596: Fixed examples, code to be more consistent
DDF-619: Made activities persistent
DDF-622: Persistent activities deletable