Implement mouse over radar for selecting vertices. In progress #138.
Need data series in radar's hit. Work for #138
Mouse tracking in radar sample added to show the new feature
Merge branch 'master' of https://github.com/HumbleSoftware/Flotr2 into radar-mouseover
Fix JSHint extra commas
Use 2 spaces for tabs as in the rest of the code
Merge branch 'radar-mouseover' of https://github.com/Bitergia/Flotr2 into radar-mouseover

Conflicts:
	flotr2.min.js

Resolved with rebuild.