adding django-heroku-memcacheify to requirements.txt
using memcacheift in settings to get it's env vars from heroku
removing the comment and the timeout parameter as discussed in #94
oh, nice, it default is to fallback to django simple caches if local
refs #94
Merge pull request #94 from arruda/heroku-memcacheify

Add django-heroku-memcacheify to requirements and use it in the settings