Updating the release note generating script to handle the YouTrack filter.

#12
Updating the name of the YouTrackFilter to IssueFilter to be more generic.

#12
Updating the nBuildKit settings.props to match up with the current state of the scripts.

#12
Merge pull request #12 from pvandervelde/issue/releasenotefilter

Msbuild: Allow users to specify filter for issue tracker when creating release notes