Changed the way data is stored in Elasticsearch. Each dataset now has its own index and data is not normalized before it is stored.
Ignore Sublime Text project files.
Destroy data mappings when their dataset is destroyed.
Remove items_imported from ImportOperation.
Fix mistake in es_index definition.
Only save rules to Gnip while there is an ongoing import for the Gnip dataset.
Validate presence of data mapping on FileDataset.
No need to check for an import operation in progress, since there must be one for the rule to be present in Gnip.
Update UI for changes to data model.