Move target descriptions inline and add targets for running Travis builds to a separate, included Makefile.

We run Docker containers on Travis, including one for MySQL. However, we haven't actually be using it! These changes update the test settings required to make the switch from SQLite to MySQL, fix a variety of bugs in tests that were hidden by SQLite, and introduce new Make targets which make it easy to run tests locally in the same way that Travis runs them.

Changed the marketing_url property to use the slug from the program_type object instead of the name of
the program_type.  Added a unittest to verify that the URL generated by the marketing_url property
not only has the elements we're expecting but that it is a valid URL in general.

ECOM-6813

ECOM-6825

ECOM-6830

ECOM-6824

Ecom-6713

ECOM-6801

ECOM-6766

ECOM-6799

ECOM-6795

Add waffle switch for hiding featues.

ECOM-6797

ECOM-6798

Unmarketable runs are defined as those course runs that are published, have seats, and can still be enrolled in, either now or in the future.

ECOM-6768

ECOM-6043

Ecom-6074

Runs without seats should not be considered marketable.

ECOM-6768

ECOM-6793

Ecom-6041

ECOM-6057

ECOM-6054

ECOM-6636

ECOM-6765

Ecom-6769

Create a mixing using decorator so that It can be use in drf also.
Only authenticated users can access the create course page.

Ecom-6094

Update the change state view so that permission view can be user to checking the
authentication.

Ecom-6687

Add char limits to prereqs and descriptions
Add pixel limits to image uploads

ECOM-6636

This allows us to upgrade from pylint 1.5.4 to 1.6.4.

ECOM-6045

ECOM-6048