"Rebuild Last" Action and JENKINS-14905

Added new "Rebuild Last" action on the project level. Improved the Rebuilder to add rebuild option for builds that ran before installing the plugin. 

-Fixed (RebuildActionFactory): JENKINS-14905 Make "Rebuild" button available for builds before plugin installation time
-Fixed in test: JENKINS-14387 Cause of rebuilt job should be Cause.UserIdCause 
-Added new feature: Rebuild Last on project level
-Added HtmlUnit test to validate Rebuild and Rebuild links