Bug 836106: Ensure basket data is in sync with ET.

Fix issue with 500 errors on ET errors.
Bring README.rst up to date

Update some commands that were no longer accurate.
Bug 843103: Upgrade to latest basket-lib, which has upgraded Django.
Merge pull request #19 from pmclanahan/bug-843103-upgrade-django

Bug 843103: Upgrade to latest basket-lib, which has upgraded Django.
Merge pull request #16 from dpoirier/update-readme

Bring README.rst up to date
Add ALLOWED_HOSTS setting.
Add hit counting and view timing with statsd.
Merge pull request #20 from pmclanahan/add-statsd

Add hit counting and view timing with statsd.
Merge pull request #15 from pmclanahan/keep-users-in-sync

Bug 836106: Ensure basket data is in sync with ET.
Bug 806327: Enable async ET operations.
Merge pull request #21 from pmclanahan/bug-806327-async-subscribe

Bug 806327: Enable async ET operations.
Update admin to include celery.
Optimize celery settings.
Disable all celery result storage.
Store newsletter data in basket

- Add database models to store information about newsletters, e.g. name,
  description, whether active, supported languages, etc.
- Add an API call to fetch that information.

Bug 841426
Merge pull request #22 from dpoirier/store-newsletter-data

Bug 841426: Store newsletter data in basket