adding buildnumber-maven-plugin and maven-war-plugin plugins in order to generate build numbers for cache busting
changing buildNumber name to go in MANIFEST in pom
adding cache busting tag
adding url rewrite for scripts
adding correct rewrite params to accept versioning for build numbers
removing type from cache buster tag
changing tag name
modifying all js file script tags to use new cachebusterscript tag
closes #507 by invalidating cache on js files based on build number
Merge pull request #544 from denimgroup/bugfix-tfgh507-javascript-cache-bust

Bugfix tfgh507 javascript cache bust
Merging with 2.1final