- Fix for `ruby-rewrite` not rewriting files if any rewriter was loaded, due to it getting confused about the filename.
Add test case for `ruby-rewrite` not actually rewriting files when a rewriter is loaded.
Make running tests via Rubinius (but not via Travis) pass.
Use `Dir.mktmpdir` instead of `FileUtils.mkdir`.
Merge pull request #162 from MrJoy/fix_file_rewriting_with_rewriters

`ruby-rewrite` fails to actually rewrite the input file when a rewriter is loaded.  This fixes the issue.