Update fabfile.py

Deployment using fab is so much easier. Have updated the bootsrap process to include the following steps:
1. Create an app
2. Install all addons
3. set all the config vars
4. `syncdb`
5. `migrate`
6. `collectstatic`
7. `compress`
8. Initialize the New Relic monitoring addon.

You can now bootstrap a named app (e.g. my_super_app) using fab by simply typing `fab bootstrap:my_super_app`. If you don't want a named app, simply use `fab bootstrap` and heroku will auto-name the app for you, as usual. :)

As always, feel free to reject the pull-request. Just something I have been using, thought I'd share it.