Version 3.0 - Setup in Interface, Use NSArray to load data, Customize visual appearance

Bar Charts can be added directly from the interface instead of through
code. Just add a UIView to your View Controller and change its class to
BarChartView. Then set it up in your implementation. Take a look at the
improved sample project for more information.

Load data into a Bar Chart using an NSArray rather than an XML File.
Use the new method to format and generate data for use with a Bar
Chart: [createChartDataWithTitles: values: colors: labelColors:]. Refer
to the new documentation for more information.

Less formatting is required for XML data loading. Use
[dataWithContentsOfFile: values: colors: labelColors:] to set Bar Chart
properties (rather than doing so in your XML file). Refer to the new
documentation for more information.

Set which axis to display using the AxisDisplaySettings type. You can
set this property when loading data into your Bar Chart

Added new methods and types to change the visual appearance of the Bar
Chart

Fixed bugs and memory leaks

Code cleanup and reorganization to make it easier on the eyes.