Merge pull request #42 from imod/conditional-buildstep

[FIXED JENKINS-18967] update/delete project references in conditional buildsteps
Added a comment for the change of pom.xml by imod.
[maven-release-plugin] prepare release parameterized-trigger-2.20
[maven-release-plugin] prepare for next development iteration
Fixed CRLF to LF in pom.xml. It changes when released with Windows.
Added tests for deleting projects with folders, and a test for computeRelativeNamesAfterRenaming.
ported computeRelativeNamesAfterRenaming from hudson.model.Items.
Added a test for fix of NPE in BuildInfoExporterAction.
Return a list containing null with getTriggeredBuilds if the project is deleted.
Merge pull request #45 from ikedam/feature/ItemGroupSupport

  Item Group Support (improvement of #43), including fix for JENKINS-19793 (#44)
[maven-release-plugin] prepare release parameterized-trigger-2.21
[maven-release-plugin] prepare for next development iteration
Change CR+LF to LF in pom.xml.
expand variable in project names looking for unresolved names
also simplify getProjectList, as Items.fromNameList already do trim names.