Make mako template lookups pluggable.

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This code adds the ability to add Mako template lookup directories on
the fly, allowing third party add-ons to contribute their own Mako templates.
A new API function for registering Mako templates is introduced::

    from edxmako import add_lookup

    add_lookup('main', '/path/to/templates')

    # Or, specify a package to lookup using pkg_resources.  This will
    # add the 'templates' directory inside the current package:
    add_lookup('main', 'templates', package=__name__)

Markhoeber/documentation/google hangouts

Increase timeout for ORA get feedback promise in bok-choy test.

Fix link to testing document.

Prevent from tabbing on lostpassword link in login page

Unicode changes to support R to L script

wire in env settings into aws.py for session inactivity timeouts

For capa modules if weight is 0 don't try to create Progress objects.

LMS-1494

Fix pathological po growth

Added more descriptive page titles.

Cache databases to speed up acceptance tests

fixing unit tests

fixing merge error

fixing xqueue submission issue with unicode url (trial 0.1)

fixing fotmats as commented upon

removing yaml file language selection

Unicode changes to support QRF

removed unnecessary pass in modulestore/init.py

fixing merge error

fixing fotmats as commented upon

removing yaml file language selection

fixing pep8 violations

- fixing pylint violations

pylint violation

fixing line spaces and formats

ignore pylint E1101

remove empty line

fixing pylint violations

 pep8 violations

bulk mail unicode/decode

fix migration error

fix pep8 just to push again

more unicode/decode
Final changes to comments and error messages.

Add AWS.py configuration hooks to tie in login failure lockout parameters

Optional Password Policy enforcement

Use status code 400 when there is a validation error in creating an account

Use status code 400 when there is a validation error in creating an account.

Note to Instructors on Regular & Beta Dashboard

Force unique course_id for bulk email authorization

LMS-2134

/register_post is an invalid URL

- Added note to instructors on Forum Admin page of Instructor Dashboard.
- Made Role Info divs permanently displayed, but under the user list.

Change the from address for LinkedIn emails

improve error reporting for reload_forum_users cmd (one-liner)