number of issues are addressed here:
* x axis formatting doesn't apply in bubble chart
* adding option to show/hide bounds of x and y axis
* with a flaky 'auto' margin mode, allow user to specify hard values or
auto
* x label font-size was different than y axis
* show more options and reorg Control panels for Axes in `line` viz
* 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