Allow component sources to be relative to the installer directory
Merge pull request #131 from sillsdev/UNCPathTolerant

Unc path tolerant
Merge pull request #135 from andrew-polk/ImproveMakeWixForDirTree

Allow component sources to be relative to the installer directory
Correct InstallerSourceDirectory parameter

Don't get the directory name.  It already is a directory.
Also convert to an absolute path.
Merge pull request #137 from andrew-polk/ImproveMakeWixForDirTree