* chartjs test
* [WIP] Modified for Chart.js
* Tweaking styles ( tooltips and lines )
* Almost done
TODO:
Change tooltips to HTML tag
Improve color function
* More work on Tooltips
* Improve update logic
Fix linting
* resolve conflict
* [WIP]
Create new tooltip mode hack.
Add axis padding to top and botton to prevent axis cutoff
* TODO: cleanup
* FIXME: tooltip in history graph not working correctly
reorganize some code
* fix build problem
* Fix color and tooltip issue
Fix label max width for timeline chart
* update dep
* Fix strange color after build due to `uglify` bug with reference the minified version.
Make line chart behavior more similar to Google Charts.
Make the chart honor to `unknown` and other state by manually calculate point value.
* fix bugs
* Remove label for only one data in timeline chart.
Fix bug for infinite loop in some cases
* Add HTML legend to chart.
* Fix isSingleDevice bug due to calculation.
Add isSingleDevice property support.
* fix for lint
* Replace innerHTML code with polymer node.
* Replace tooltip with HTML code
* fix tooltip style
* move default tooltip mode to plugin
* LINTING
* fix
Move localize history data to Timeline Chart.
Fix timeline static color.
Rework on chart resize.
* Bug fix:
Chart may disappear on some case.
Timeline chart calculation issue.
Change timeline chart hidden logic.
* fix tooltip
rework for resize event
* lint
* element
* Replace `var` to `let`.
Move import and ChartJs injection code to `ha-chart-scripts.html`.
* lint: convert more let to const
* fix font
fix undef
* update bower.json
* move
* Load chart code on demand
