Patches for Windows

These patches enable IRuby to work on Windows. I tested them with Ruby 2.0.0p195 [i386-mingw32], on Windows 8.1. Maybe they also work in other environment like cygwin.

If these codes break your code-style, please tell me the points.
It not work If not adding gsub('/', '\\\\\\')
If not, Ruby write to 'ipython_config.py' like:
["C:/Ruby200/bin/ruby.exe", "C:/Ruby200/lib/ruby/gems/2.0.0/gems/iruby-0.1.13/bin/iruby"]
Then, when python evals ipython_config.py, python interpreter think there are '/R', '/b', '/r', ... etc.