Better i18n extraction and translation

Upgrade rednose

TE-779

The latest release of rednose will allow for output of the
flaky test repoort. (It was being swallowed in rednose 0.3)

Here is the diff: https://github.com/gfxmonk/rednose/compare/version-0.3.1...version-0.4.1
Here is likely the commit we care about most: https://github.com/gfxmonk/rednose/commit/c66b37c92bb02ad8c16cabe7863cf6cb50c70adc

Update path.py to version 7.2

Fix help token for Studio > Libraries: Learn More button

1. Extract the full sentence rather than parital of a sentence, so that languages with different word orders than English can benifit from this.
2. Using ngettext instead of gettext with 'xxx(s)', as Transifex treats `()` as special characters so that it enforces the translated string must have the same number of `()` pairs. Such enforcement makes translations difficult, as not every language can use forms like 'xxx(s)' to represent both singular & plural within a single word.

Removed references to code ownership page

Correcting heading levels

Aamir khan/ecom 1289 reverification service

Make some cms strings i18n

Omit migrations when calculating bok-choy coverage.

When we calculate bok-choy coverage, we are including various migraitons
as part of the calculation. This does not represent the kind of
code that bok-choy can cover, since that is part of the RDBMS build-out
and maintenance.

Because no one actually uses that page

Make e-mail activation optional

Fix i18n breaking in some js and underscore files

Add i18n_fastgenerate

use different queue for smaller emails (TNL-1591)

Redirect Enrollment API to Platform API doc

Update translations (autogenerated message)

Add mentoring v2 and its bump dependency xblock-utils for Harvard

1. Spliting strings inside the call to `gettext()` in javascript breaks the string extraction process, so the string should kept in one line.
2. Using escape string inside a string in `gettext()` may cause the extractor to misunderstand the escape string, so that it will escape this escape string.

So the time-consuming i18n_extract step can be skipped for situations that only the translated strings are modified while the source strings are still the same.

Merge release back into master (hotfix-2015-04-03)

Hotfix: Add proxy to allow IE9 to make xdomain requests

Move debug toolbar to end of devstack middleware

Update SKU field help text and verbose name

The django debug toolbar circumvents other middleware with process_view
functions, so it needs to go at the end of our MIDDLEWARE_CLASSES
setting.

https://django-debug-toolbar.readthedocs.org/en/1.3/tips.html#middleware-isn-t-working-correctly

Fix duplication of Randomized Content Blocks

Update XBlock Hash

PLAT-520 Fix Asset store import of null values.