Sensible git ignore file
Move to Procfile-based setup

This does two things:

* one command to run both jekyll and sass - no  more dealing with two terminals or background jobs
* Use a development only config to override the url so that you don't have to keep editing the config between dev and production.
Remove unix commands

Change the rake stuff to more task-oriented, e.g. you want to do X, so
type Y
Merge pull request #5 from davetron5000/procfile-based-setup

Procfile based setup