[FIXED JENKINS-12076] The build parameter for the number of release builds to keep was not being saved and thus not used.
[JENKINS-12076] Corrected the name of the public setter for numberOfReleaseBuildsToKeep.
Merge pull request #10 from dlvenable/fix-number-of-releases-to-keep

[FIXED JENKINS-12076] Correctly save "number of release builds to keep" parameter