upgrade migrations to django 1.8

TNL-3658

Support wildcards in unaffected paths.

This commit adds ability to use wildcards denoted by the '*' character
in unaffected paths. The wildcard will match a sequence of zero
or more arbitrary characters.

Example: /*/student_view

To allow access to certain URLs without any auth or cookie, like
'/heartbeat'

Meant to avoid infinite redirect when matching the redirected URL with
the current URL.

Checks for the presence of a cookie with specific values when activated,
and redirect the user to a configurable URL when it is not found, or not
with an accepted value.

To be used to display a splash screen to users upon the first visit.
It's the responsability of the splash page at the redirected URL to set
the proper cookie value before sending users back to the LMS.