iOS / PNChart

FIX related with XLabels 

Now you can use showLabels, setXLabels, etc in different order.

Add ability for PNCircleChart to go clockwise 

Less Precise Line Chart

…r a line will trigger the userClickedOnLinePoint and userClickedOnLineKeyPoint delegate methods.

empty lines and indentation

Removing existent subviews before adding new ones in PNBarChart

Added UICountingLabel dependency

Added labelColor property to CircleChart gradeLabel

Default value is PNDeepGrey, however this didn’t always look nice. So I
added a labelColor property to the CircleChart.

fixed #29, #24 & #23

fixed issue #24

Continuous updating of PNCircleChart

In order to update one PNCircleChart which is made previously,
gradeLabel has to be private property of PNCircleChart.
Bacause I don't want previous gradeLabel to be kept on the UIView for the above purpose,
I wrote this patch. Please consider this specification.

Added support to define a color per bar.