Update M2ReleaseAction.java

JENKINS-13465
[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 #9 from glandais/master

Proposed fix for JENKINS-13465
Merge pull request #10 from dlvenable/fix-number-of-releases-to-keep

[FIXED JENKINS-12076] Correctly save "number of release builds to keep" parameter
[maven-release-plugin] prepare release m2release-0.10.0
Merge tag 'm2release-0.10.0'

Conflicts:
	src/main/java/org/jvnet/hudson/plugins/m2release/M2ReleaseAction.java
Introduce an intermediate bugfix version