Fix CatchOutput types on Py3k.
signal: Remove unnecessary type casts.
Remove unnecessary shebangs.

These files do not include any code that could be run standalone.
signal: Stop exit()ing from arpicker.

Raise the correct Python exception instead.
signal: Stop exit()ing from ppick.
signal: Stop exit()ing from X_corr.
Don't install .git files.
removing obsolete win-py2.7, closes #488

windows dependencies are easily installed via the clickable exe
installers from (most noteable scipy-stack):
http://www.lfd.uci.edu/~gohlke/pythonlibs/