Bump project dependencies

Resolves: https://www.pivotaltracker.com/story/show/70774640
updated checkstyle dep and moved config into pluginManagement
Add javax.servlet-api dependency

Follow-on to: https://www.pivotaltracker.com/story/show/70774640
Update license header date

Resolves: https://www.pivotaltracker.com/story/show/70885006