Merge pull request #47 from Gillingham/develop

Merge in support for price data URL setting
Update settings.py

Add default value for PRICE_URL so we don't break existing evething installs of those who pull in the changes to the priceupdater task.
Merge pull request #51 from Gillingham/develop

Pull in fixes for #34
Merge pull request #4 from madcowfred/develop

Develop