[JENKINS-19843] Provides an extension point for other plugins to support rebuild plugin.
[JENKINS-19843] Removed setters frpm RebuildParameterPage. Developers set its properties with the constructor.
[JENKINS-19843] Add an instruction to add a dependency to rebuild plugin to pom.xml.
Merge pull request #17 from ikedam/feature/JENKINS-19843_RebuildParameterProvider

[JENKINS-19843] Provides an extension point for other plugins to support rebuild plugin.