[FIXES JENKINS-20932] Avoid NPE by checking the getLastSuccessfulBuild() for null before calling resolveProject()
Merge pull request #56 from recampbell/jenkins-20931

[FIXES JENKINS-20932] Avoid NPE by checking the getLastSuccessfulBuild()...
Merge pull request #55 from ikedam/feature/JENKINS-19990_SupportNonasciiProperties

[JENKINS-19990] Support Non-ascii properties
[FIXED JENKINS-21013] Matrix project support for "Parameters from properties file".