Fix python script crunchbang lines

Change the crunchbang lines from /usr/bin/python to /usr/bin/python2,
since most distros are moving on, and the current release is python3, so
it is reasonable that /usr/bin/python has been symlinked to
/usr/bin/python3.
Merge pull request #31 from darkfeline/patch-crunchbang

Fix python script crunchbang lines