iOS / PNChart

Show only titles, not values nor percentage

Conflicts:
	PNChart/PNPieChart.h
	PNChart/PNPieChart.m

Enhancements to Bar and Line Charts

2. You can specify the border color for a PNBarChart
3. Fixed some problems in PNBarChart whereby the top and bottom margins were not being respected.
4. PNLineChart now has the same margin properties as PNBarChart so that you can overlay them and have the bars and the points in the LineChart line-up nicely.
5. You can now specify for a PNLineChart that points display their value using a font, format and color, just above the point itself.
6. A PNLineChartDataItem can now have two values, a raw value for displaying via the formatter, and the graded value which is used to determine the position of the data point.  The former is new.  This allows you to have multiple line charts that have different min-max values and yet overlay them.  The new value can then be used to display a value meaningful to the user whilst the old value is used to render the chart point.

Using the Right Shadow Color instead of the Green Color

…art into openhood-independant-margins-bar-chart

Added decimal options for circle chart

…rrygdm-multiple-selection

PieChart: add updateData() method

PieChart: redraw chart if layout changed

Fix iOS version requirements in README

This is to support autolayout and constraints.

Resize layers for current bounds on layoutSubviews.
For that to work we need to have radiuses recomputed on each draw.

As a bonus you can now orverride `recompute` method to change
inner and outer radiuses. With possibility to change other attributes
in a subclass.

...to avoid confusion for people trusting the README.

Piechart labels filter based on values

I added this property because showing all labels, when there are a lot of small items in the dataset, is quite confusing.

Example:
piechart.labelPercentageCutoff = 0.05
hide all labels with value less than 5% (I use this most of the times).

Leii

Merge from origin

Add prefix/suffix public property for y label values