Added momentum scrolling and "rubber band" snap-back code from Travis Fischer.
Added documentation and private properties for all iVars. Cleaned up the code to conform with Core Plot coding guidelines.
Added utility functions to compute the minimum and maximum of two NSDecimal values.
Added an absolute value function to the NSDecimal utilities.
Updated the momentum scrolling and elastic plot range code to use CPTAnimation instead of blocks. Added support for the y-range in addition to the x-range.
Updated the Mac CPTTestApp to demonstrate momentum scrolling and elastic plot ranges.
Merged the momentumScrolling branch into default. Fixed issue 531.
Fixer a bug with elastic plot ranges.
Built new HTML docs.