Upgrade Spring Security

This change upgrade Spring Security to 3.2.0.RC1, making changes to
account for API modifications.

[#55454768]
Merge 55454768-security-upgrade to master

[Completes #55454768]
Merge remote-tracking branch 'upstream/master'
Integrate Font Awesome

This change integrates Font Awesome into the application.  It creates
a logout icon to demo the functionality, but it does not yet work and
is not formatted correctly.

[#55172952]
Merge 55172952-font-awesome to master

[#55172952]
Merge branch 'master' of https://github.com/gopivotal/github-cla-integration
Improve User-links and validate input fields