Fix sys.path manipulation in pavement.py, with detailed comment

Restore reverted changes from paver part 1

lms/envs/bok_choy.py

@@ -24,7 +24,7 @@ from .aws import *  # pylint: disable=W0401, W0614
 
 ######################### Testing overrides ####################################
 
-# Needed for the `reset_db` management command
+# Needed for the reset database management command
 INSTALLED_APPS += ('django_extensions',)
 
 # Redirect to the test_root folder within the repo

lms/static/coffee/README.md

@@ -34,10 +34,9 @@ Conveniently, you can install Node via `apt-get`, then use npm:
 Compiling
 ---------
 
-The dev server will automatically compile coffeescript files that have changed.
-Simply start the server using:
-    
-    $ rake runserver
+CoffeeScript is compiled when you update assets using the command:
+
+    $ paver update_assets
 
 Testing
 -------