• Removed old compute method which returned coordinates

• Added compute(at x:CGFloat) -> CGFloat to enable composition.
• Improved rendering time by batching multiple equations together.
• Added optional domain property to Equation to enable drawing portions of a graph.
• Added autoUpdatesAfterAddingEquation which controls automatic re-rendering each time equation an equation is added. true by default.
• Updated Readme & sample screenshot.

Initial release with decent documentation.