Use requirements files in fab script

[adieyal]

I've created a requirements directory with all your dependencies. I didn't want to make changes to the fabric script because they would require a largish refactoring of your script.

You need to run pip install -r requirements/production.txt

[petrus-jvrensburg]

Okay, I made the updates in 56f75c3ff03786aee207897443e00273f12b8d4a.