replace shebang => null line in __init__.py.

The __init__.py is not executable.
But it has a shebang.  So rpmlint is warning.
So Fedora executes "sed -i -e 1d" in etcleeper.spec.
http://pkgs.fedoraproject.org/cgit/etckeeper.git/tree/etckeeper.spec
Upstream should not worry downstreams.
Please see also:
https://github.com/joeyh/etckeeper/pull/15

	modified:   Makefile
	modified:   etckeeper-bzr/__init__.py