iOS / PNChart

…xis (_yLabelSum) depends on the number of different Y values, avoiding the  duplicate labels on Y axis.
Also modify getYValueMax and setYValues methods to ensure the max value of Y axis (_yValueMax) and the number of labels on Y axis (_yLabelSum) are even to avoid when the Y labels hasn't decimal values (default value for _yLabelFormatter) the axis label position not match with the value

This reverts commit c330cf08.

This reverts commit e200b9ba, reversing
changes made to 4da58d16.

Update readme with example for legend

Legend 

getAxisMinMax - Determine these values automagically

Update PNLineChart.m

PieChart divides equally when all value of data items are 0

Show actual percentage in label

The label was showing stuff like 6000% which is not relevant if it says the % or maybe %%%.

Anyway I feel this way it is better for a default use?

I found it very useful to have this... especially for testing if not for production purposes.

Will need in the .h:
- (NSArray*) getAxisMinMax:(NSArray*)xValues;

Add setAxisXLabel/setAxisYLabel

Small cleanup and increased version number of used CocoaPod module

Added a method to allow the update of both the current and the total for...

…e chart so it's display remains overall accurate.

- (void)updateChartByCurrent:(NSNumber *)current byTotal:(NSNumber *)total;

We have a scenario where our app is pulling updates to both the "checked in" (our current) and "registered and ready to check in" (our total). Since both values can be updated, the chart would not be correct if only the option for the total to be updated was not available.

Use duration property in counting label

Fix little issue in PNLineChart.m

the delegate(userClickedOnLinePoint: lineIndex:) in method(touchPoint:
withEvent:) is never called,because the point p1 is not in each line
path.So,when touch the line path,nothing happens(the delegate is
invalid).