Switch from Rake to Paver
Change `if not args.skip_collect` to `if args.collect`

Simpler and clearer
from __future__ import print_function

and print errors and warnings to sys.stderr
write_stderr() function is unnecessary
Pull Paver requirements out into a separate file
Insert *right* at the front
Changed str->unicode in common/djangoapps/utils/.

LMS-2436
Submission history view not internationalized.
LMS-2167
Removing ipython from edx dependencies.

Ipython is not strictly required to run edx-platform. It can
be setup as part of Vagrant provision scripts, or manually
by each developer as required in specific cases.
Merge pull request #2938 from edx/waheed/lms2167-show-submission-history-not-internationalized

Internationalized submission history view.
Some more str->unicode fixes in instructor and courseware apps.

LMS-2429
Merge pull request #3047 from edx/valera/add_ipdb_requiement

Removing ipython from edx dependencies
i18n: make emails in lms translatable

The email texts in lms/templates/emails are not extracted by rake i18n:generate because the babel_mako.cfg does not include them.
And a several emails are not translatable because they do not use ugettext.
Revert to older version of TinyMCE.

We had trouble with Cloudfront/hashed files and need more time
to investigate.
This reverts commit e8f53ac9dc6d8a1d9928787635c7c5f7e409a9ec.
Merge pull request #3048 from louyihua/master

Make emails in lms translatable
Documentation for static page changes

STUD-1347
Merge pull request #3067 from edx/christina/revert_tinymce

Revert to older version of TinyMCE.
Merge pull request #3005 from singingwolfboy/db/paver

Paver v3
Merge pull request #2928 from edx/markhoeber/documentation/stud-1347

Documentation for changes to static pages
Merge pull request #3070 from edx/adam/middleware

wiki middleware fix (LMS-2461)