6.1.0

1. Support drawing produced by TRatioPlot, including interactive zooming
2. Fix problem with TF1 drawing from histogram list of primitives
3. Let disable showing of StreamerInfo in the GUI by adding &skipsi to URL
4. Provide tooltips when TH1 drawn with "E" or "P" option
5. Fix problem with zooming of many overlayed histograms
6. API change -> PadPainter.zoom function returns Promise now
7. Support gridx/y, tickx/y, logx/y options for (multi) graphs painter
8. Provide simple Rebin functionality for TH1 (#210)
9. Use jQuery dialog to input values, avoid prompt() which not always supported (#216)