Moved the AUTHORS_FILE outside of the def section to resolve the ruby error:
C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in
  `gem_original_require': ./converter.rb:152: dynamic constant assignment (SyntaxError)
                AUTHORS_FILE = "authors.xml"
                              ^
        from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in
`require'
        from vault2git.rb:5
Add quotes around the source and dest parameters in the SETWORKINGFOLDER vault command to resolve an error changing the working directory if there's a space in the Vault path.
A failure isn't caught but instead the revisions are retrieved into the current working directory. vault2git will fail to see and commit the files in that case.
Added a QUICKSTART file to help those that might be inexperienced with Ruby (like me) and had some trouble getting an environment up and running to execute the script.