Update spring security to v4.2.15.RELEASE
Update spring security to v4.2.15.RELEASE

jonathanmtran/uPortal,ChristianMurphy/uPortal,jonathanmtran/uPortal,Jasig/uPortal,bjagg/uPortal,bjagg/uPortal,mgillian/uPortal,bjagg/uPortal,Jasig/uPortal,jonathanmtran/uPortal,ChristianMurphy/uPortal,mgillian/uPortal,mgillian/uPortal,Jasig/uPortal,ChristianMurphy/uPortal