Data sources model
Move logging setup to __init__.py so it's always available
Refactor Job class to be easier to extend.

Moved the Redis logic out of it.
Move query runner creation to worker based on data source in Job.
Update angular-resource to 1.2.7
dict representation for DataSource.
Show query's data source.
Use datasource when executing queries.
Fix: query wasn't saving.
Put deprecation comment for data source settings.
Remove QueryFiddle ctrl.
Remove definition of QueryFIddleCtrl.
Move Highcharts color definitions to highchart's code file
Add DataSource to models list
Fix importer to use data source
Data Source factory
Fix tests to use data source
Add data source to QueryResult
Fix import job to use data source with query result.
Fix QueryResult factory.