* need to be in mitx/ to install common/lib/*
* create data dir if it doesn't exit
* add a few more log messages
* Change url for our fork of django-pipeline to stop the hanging checkouts.
  It works either way on my machine, so not sure if this will fix it.

These are then displayed at /courses.

These are then displayed at /courses.

* Add "git+" to start of django-pipeline url.  Fixes dev install on my system.

* Make sure we're installing django-pipeline from our fork
* Bump rake to 0.9.2.2, as 0.8.3 is already outdated.

Display specific error messages when parts of the courseware break, rather than returning a 500 indicating that the whole site is down