JENKINS-18968 add grails support.
[FIXED JENKINS-18969] Add dsl method to allow broken build claiming.
[FIXED JENKINS-18964] Add dsl method to add clone workspace SCM.
set grailsContext.useWrapper. add grails(targetsArg, grailsClosure) version. add test for the useWrapperArg.
Conditionally set pom arg.
Merge pull request #79 from quidryan/conditional-pom

Conditionally set pom arg.
Merge pull request #75 from wolfs/cloneWorkspaceScm

[FIXED JENKINS-18964] Add dsl method to add clone workspace SCM.
Merge pull request #76 from sheehan/JENKINS-18968

JENKINS-18968 add grails support.
Deal with enums a little better
Supporting multiple parameters.
Merge pull request #77 from wolfs/claim

[FIXED JENKINS-18969] Add dsl method to allow broken build claiming.