This should fix issue #1339.
IE 11 and lower has a long standing issue: out-of-document element's
pathname has no leading '/'. See
https://connect.microsoft.com/IE/feedbackdetail/view/1002846/pathname-incorrect-for-out-of-document-elements
And Superset's Slice.jsonEndpoint() method relies on pathname() to build
JSON API URL for slices:
```javascript
jsonEndpoint() {
const parser = document.createElement('a');
parser.href = data.json_endpoint;
let endpoint = parser.pathname + this.querystring();
endpoint += '&json=true';
endpoint += '&force=' + this.force;
return endpoint;
},
```
`parser` above is exactly an out-of-document element. Therefore when
running in IE <= 11, Superset would build wrong JSON endpoint URLs,
hence the 404 errors for loading data for slices.
This commit adds a simple workaround when leading '/' is missing in the
value returned by pathname().
* 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
