Add Subversion support via SvnScmProvider and register it in ScmInfoPlugin
Replace \ with / in source path; ScmInfoPluginProjectSpec tests now pass on Windows.
Add dependency on svnkit for Subversion support.
SVN Support: change the supports check to only look for a .svn directory, and rename head to base to reflect naming differences between git and svn.
Merge pull request #10 from petercgrant/master

Add Subversion support and standardize source path separators