grosser/parallel_tests — pull request #262 by jdenen (2013-09-30 18:43:54+00:00)
Title: Add second condition for determining Windows platform

You're currently using
```ruby
RbConfig::CONFIG['host_os'] =~ /win32/
```
to identify when the gem is being used on Windows. This works for JRuby on Windows 7, which results to ```mswin32```. But on Windows 7 and MRI 1.9.3, this results to ```mingw32```.

My PR just adds ```/mingw32/``` as a condition for identifying the Windows platform.