Merge pull request #4 from emsa23/master

Adding Different Queue Sorting Strategies and Strategies to assign Priorities to Jobs.
Updated README.
Updated description and scm section.
[maven-release-plugin] prepare release PrioritySorter-2.0-beta-1
Fixed error in scm section.
[maven-release-plugin] prepare release PrioritySorter-2.0-beta-1
[maven-release-plugin] prepare for next development iteration
Merge pull request #5 from emsa23/master

Bug fixes and enhancements
[maven-release-plugin] prepare release PrioritySorter-2.0-beta-2
[maven-release-plugin] prepare for next development iteration
Use parameterName (variable) not "parameterName" (literal)
Protect QueueSorter from NPEs
[maven-release-plugin] prepare release PrioritySorter-2.0-beta-3
[maven-release-plugin] prepare for next development iteration
Merge pull request #4 from jenkinsci/master

Rebase from master-repo