Implement Utils.sortedIndex for use by crosshairs
Initial implementation of Crosshairs.
TODO:
- Styling
- Unit Testing
- Docs
- Cleanup API
Crosshair styling now set in plottable.css
Move sortedIndex implementation to osUtils.ts, include _ license
Simplify Crosshair API to minimal prototype version
Basic unit tests for CrosshairsInteraction
Minor change to unit test message
Remove commented line
Fix plottable.*
Merge pull request #152 from palantir/add-crosshairs

Add crosshairs