Adding PNScatterChart - DataItem
Adding PNScatterChart - Data
Adding ScatterChart cell to tableview

* tableView in Main.storyboard
modifying PNScatterChartData
adding Scatter Chart code to viewController

** scatter chart programmatically
** adding header to header files
Adding Scatter methods

PNScatterChart in UIView
drawing UI methods on the background thread
Adding Scatter Graph to PNCHart

* this is compatible with new release.
* because of your huge change, I had to change the position of my codes
from viewController to tableViewController.
* minor changing and improvement.
Merge pull request #130 from MrWooJ/feature-ScatterGraph

Feature Scatter Graph