* [formats] add better defaults for time + number formatting
* [formatDate] add tests for concise formatDate
* [nvd3] use verbose time format in tooltips
* [number format] improve number format description
* [formats] revert to .3s defaults, tweak number format preview
* [formats] default number vis to .3s
* Use 'count' as the default metric when available
Count is a much better default than the current behavior which is to use
whatever the first metric in the list happens to be.
* Addressing nits
* Introduce Javascript controls
This allows power-users to perform intricate transformations on data and
objects using javascript code.
The operations allowed are "sanboxed" or limited using node's vm
`runInNewContext`
https://nodejs.org/api/vm.html#vm_vm_runinnewcontext_code_sandbox_options
For now I'm only enabling in the line chart visualization, but the plan
would be to go towards offering more power to people who can write some
JS moving forward.
* Not applied
Users can define `label_colors` in a dashboard's JSON metadata that
enforces a label to color mapping.
This also makes the function that maps labels to colors case insensitive.
* DECKGL integration
Adding a new set of geospatial visualizations building on top of the
awesome deck.gl library. https://github.com/uber/deck.gl
While the end goal it to expose all types of layers and let users bind
their data to control most props exposed by the deck.gl API, this
PR focusses on a first set of visualizations and props:
* ScatterLayer
* HexagonLayer
* GridLayer
* ScreenGridLayer
* Addressing comments
* lint
* Linting
* Addressing chri's comments
* Allow for multiple color schemes
1. create ColorSchemeControl component
2. using the same new control component for linear colors
* add color spectum for linear color scheme
* remove dup css
* fix controls setting for linear color scheme
* minor fix by code review comment
