[bug 788281] Add update_product_details step to Getting Started
[bug 788281] Remove the wrong django-mozilla-product-details
[bug 788281] Add django-product-details

* add django-product-details (the right one with my bug fix)
* update jenkins test script so it downloads product details before
  running tests
* fix locale_name helper tests and add a test for the Unknown case
[bug 788281] Implement basic events API

This implements a really basic events API that exposes release dates for
Firefox and Firefox for Android. It has a couple of really basic
filters. It's otherwise pretty uninteresting.