Fix guides
SEC-2416: Fix Hello MVC guide
Polish Guides
Ensure artifactory uses customized pom
Update samples to declare repository already added
Updates to pom.xml author and repo
SEC-2430: Add Maven BOM
SEC-2430: Enable artifactoryPublish on bom
Update to spring.io
SEC-2385: Polish Gradle Spring 4 usage doc
SEC-2431: UrlAuthorizationConfigurer missing <HttpSecurity> in doc
SEC-2422: Session timeout detection with CSRF protection
SEC-2435: Update to Gradle 1.10-rc-2
SEC-2326: CsrfRequestDataValueProcessor implements RequestDataValueProcessor

Previously there was unecessary complexity in CsrfRequestDataValueProcessor
due to the non-passive changes in RequestDataValueProcessor. Now it simply
implements the interface with the methods for both versions of the interface.
This works since linking happens at runtime.
SEC-2434: Update to Spring 3.2.6 and Spring 4.0 GA
SEC-2385: Polish Gradle Spring 4 usage doc
SEC-1932 Added PBKDF2PasswordEncoder.

 - Also moved some logic into a new class, AbstractPasswordEncoder. Both PBKDF2PasswordEncoder and the now-simplified StandardPasswordEncoder extend AbstractPasswordEncoder.
 - Added tests for PBKDF2PasswordEncoder .