Specify UTF-8 encoding when loading Mako template

LMS Slim Header Visual Clean-Up

Turn off automatic snapshot to tmp dir on lettuce failure

lms - revises the physical height of the edX logo within the slim-sized header and vertically aligns all elements

Add comment to dynamically-generated asset files

To avoid confusion about where these files come from, add a header
comment upon preprocessing that warns people to not modify the
generated files directly, and points them to the appropriate
template file.

Peter fogg/single click video creation

adding sympy and networkx

Fix bug STUD-103. The url base for about page links needs to be www.edx....

Studio - Advanced Component Icon

Fix/btalbot/edx.org accessibility

edx.org - revises login and register graphical banner images to include higher contrast between type and imagery

When loading a Mako template from a Django template, the file
encoding of the Mako template was left unspecified. In some cases,
this would cause the Mako template to be interpreted as an ASCII
template, resulting in blowups if the template was encoded in
UTF-8 (e.g., lms/templates/footer.html).

Now, both the input and output encodings are specified as UTF-8.

Prevent creation of unnecessary template divs, and rename .single_templates to .single-templates for convention.

Fix bug STUD-103. The url base for about page links needs to be www.edx.org for Drupal site, vs. LMS_BASE which is used for Studio. Note that the complete URL is still not correct, but a redirect exists to take it to the new location.

Ned/move loncapa etc into sandbox

Install steps - Fixes syntax of `update_templates` django command

Jonahstanley/add more tests

Preprocess assets as Django management command

Added requirement for pip>=1.3

Using `task()` reopens the definition of the task, and all we really
need to do is get a reference to the task itself to invoke it.

The :browse_jasmine_<system> and :phantomjs_jasmine_<system> tasks
depend on the :assets task, which needs to receive both :system and
:env arguments. Therefore, new tasks (:browse_jasmine and
:phantomjs_jasmine) are created that do take :system and :env args.
The old :browse_jasmine_<system> and :phantomjs_jasmine_<system>
tasks now wrap the new tasks, passing in <system> as an argument
and 'jasmine' (for :env, since it's hardcoded to 'jasmine' in
django_for_jasmine()).

The LMS/CMS server startup depends on the :assets task, which needs
to receive :system and :env arguments. Since the existing server
startup tasks didn't take a :system argument, a new command called
:runserver is created that does take :system, :env, and :options
arguments. The old server startup tasks are adjusted to wrap the one
:runserver task that does all of the heavy lifting.