* Generalize switch between different datasources.
* Fix previous migration since slice model changed
* Fix warm up cache and other small stuff
* Adding modules and datasources through config
* Replace tabs w/ spaces
* Fix other style issues
* Change add method for SliceModelView to pick the first non-empty ds
* Remove tests on slice add redirect
* Change way of db migration
* Fix styling
* Fix create slice
* Small fixes
* Fix code climate check
* Adding notes on how to create new datasource in CONTRIBUTING.md
* Fix last merge
* A commit just to trigger travis build again
* Add migration to merge two heads
* Fix codeclimate
* Simplify source_registry
* Fix codeclimate
* Remove all getter methods
Add an ENABLE_PROXY_FIX config param. When set to True, insert the Werkzeug ProxyFix
middleware. This middleware extracts and applies the X-Forwarded-* headers that are
inserted by common proxies and load balancers. Fixes#1139.
* Handling timeouts
* Fixing timer on non-utc server
* Allowing async with results
* [bugfix] database is not selected
* Making sure the session is up and running
* Cleaning up query results and query objects
* Picking a groupby and metric field on visualize flow
* Showing local time in query history
* Using pull-left pull-right instead of grid layout for table metdata
Long column name were looking weird and icons were wrapping oddly
* Linting
* Eliminating east buttons under the sql editor
* Sort database dropdown by name
* Linting
* Allowing non-SELECT statements to run
* Adding a db config
* Making sqla checkout check cross-db
* attempt to enchance logging
* clean up logging
* clean up logging
* reset to logger
* clean up imports
* add comments in config.py
* remove redundant declaration of logging.config. Already exists in caravel/__init__.py
* replace RotatingFileHandler with TimedRotatingFileHandler
* revert back running web server in debug mode
* fix debug in bin/caravel
* resolve build errors - formatting
* need to test
* enable time rotateloghandler
* revert back print statements - add feature for rotatetimelog which is needed and make it configurable
* revert back to default in master
* fix build issues
* remove extra print statement
* change log location to default
* configure console log level and format
