Fix acceptance tests
Updating lettuce tests.
Revert the deletion of the original edx header and footer.
Renaming old header and footers to legacy files.
Add IS_EDX_DOMAIN flag for header.
Updating tests and django main template.
renaming the header files for microsite backwards compat.
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__)
