Previously, multiple copies of the watchers started from the different
shells would run simultaneously, which left the possiblity of zombie
watchers, increased resource consumption, and incorrect results. This
fixes that problem by only starting a watcher if that same command isn't
already in the process list.

Fixes LMS-499

The preprocess task requires system and env arguments in order to
correctly load up the django environment to preprocess sass files to
inject themes.

In order for that task to recieve the arguments, all tasks that depend
on it also have to accept that same set of arguments.

This will all go away once the next evolution of themes arrives, which
will remove the preprocessing needed to inject theme names.

`rake install_prereqs` requires a minimal level of ruby and rake already
installed. If it doesn't exist, then print out a helpful message
indicating next steps.

Rake by default imports all .rake files in the rakelib dir, so we can
use that rather than doing our own import loop.

Sometimes the first click doesn't actually work, so call click up to 5 t...

Alex/fix is completed

Alex/fix rake doc

Fix for the failing acceptance tests

Cleanup pep8 violations in test_correctmap.py

Initialize MakoMiddleware manually during certificate grading runs.

Without this, problems fail to load because they can't find how to
render themselves, and the certificate generation grading run will
get an inaccurately low count of the possible points a user could
get (anything they didn't see will be omitted), inflating their
grade during certificate calculation and making it inconsistent
with their Progress page.

Clean up assets page notifications

Remove hack to work around multiple notification click issues -- and actually resolve
the issue so that the hack isn't necessary

Fix test_system looking like a test to nosetest. Fix class inheritance causing double counting of coverage.

Instrument sequentials with segment-io

Refactor Backbone notifications

pep8 changes made during long refactoring

Fix a bug in diff-cover

Feature/brian/regrade celery 2

This seems to fix the sporadic failure (at least on my machine).