Modify callbacks and bug fixes

• Renamed onend of flow API to done - #314
• Renamed onenter and onleave to onmouseover and onmouseout
• Added extension for zoom with reduction - #271 #310 by @danelkhen Thank you!!
• Fixed bug for data.label not shown - #295
• Fixed bug for scrolling on the chart - #312
• Fixed bug for loading Date as number - #311
• Fixed bug for flow API with non timeseries data
• Fixed bug for tick width when no data
• Fixed bug label on gauge chart when value is 0