* [explorev2] using label in 'Visualization Type' Select
* moved url related logic upstream in the caller
* moved option creation logic from render method to the constructor as
it only needs to be executed once
* Refactoring out getOptions
* Enable freeform-select with fetched column values for filter values
- db migration to add filter_select_enabled
- add freeform-multi option for Selectfield
- modify formatFilter() function on query to accomodate filter-select
* Fix js tests
* Fix codeclimate issue
* Changes based on comments
* Add test for filter endpoint
* Extract out renderFilterFormField function from render
* Fix landscape issues
* Move datasource from global store object to form_data
* Moved datasource_id and datasource_name to form_data
* Refetch defaultFormData when switching datasource
* Fixed js tests
* Get query buttonw working in explorev2
- Create new endpoint for updating explore viz
- Send over new form_data when query button is pressed
* Added endpoint test
* Changes based on comments
* Added docstring for endpoint, and query spec
* Remove white space around docstring
* Added different Select Fields
- Switched FormGroup to react-select
- Added multi and freeform to select, now it can take customized user
input and insert it as options
* Fixed tests
* Small nit based on comments
* Change in files
* Renamin files and folders
* cleaning up a single piece of lint
* Removing boat picture from docs
* add superset word mark
* Update rename note in docs
* Fixing images
* Pinning datatables
* Fixing issues with mapbox-gl
* Forgot to rename one file
* Linting
* v0.13.0
* adding pyyaml to dev-reqs