wip
Merge branch 'develop' into feature/data_import_refactor

Conflicts:
	Gemfile.lock
Removes resque-job tracking and resque-meta gems
Removes backported visualization controller
WIP stop using queue_ids to identify running imports
Imports tracking now working directly with DataImport model

- Persists append, migrate_table, table_copy and from_query attributes
  on DataImport model
- User active import jobs are now loaded from postgres instead of Redis
- Fixes imports specs
Fixes more specs
Merge branch 'develop' into feature/data_import_refactor
Stop using success DataImport attribute to check state
Undo last commit
Overrides success attribute on DataImports public values
Displays only public values on data imports api
Fix
Maintain the same format on DataImport#index API endpoint
Merge branch 'develop' into feature/data_import_refactor
Adds zip to the list of supported formats
Merge branch 'develop' into feature/data_import_refactor

Conflicts:
	lib/importer/lib/cartodb-importer/constants.rb
	lib/importer/lib/cartodb-importer/importer.rb