Removing date stamp from CSS headers

There is now a grunt ship task that can be used to datestamp the
headers before releases
Removing version and build date from CSS headers

Merge remote-tracking branch 'origin/pr/641' into develop

* origin/pr/641:
  Removing date stamp from CSS headers

Conflicts:
	manager/templates/default/css/index.css
	manager/templates/default/css/login.css