remove pystache dependency

requirements.txt

@@ -44,7 +44,6 @@ django-ses
 django-storages
 django-threaded-multihost
 django-sekizai<0.7
-pystache
 -e git://github.com/benjaoming/django-wiki.git@c145596#egg=django-wiki
 -e git://github.com/dementrock/pystache_custom.git#egg=pystache_custom
 -r repo-requirements.txt