add reindent.py and set it as equalprg

Adding [reindent.py](http://pypi.python.org/pypi/Reindent/0.1.0) to the toolbox.
autopep8 also has indentation capabilities, but i think having reindent.py also is usefull. E.g it can be used to reindent part of the code which has been refactored with a visual selection, without touching the rest of the code in the file.

The way reindent.py is set as equalprg is probably not general purpose enough.