Storyboard & Project Updates

All around maintenance on the project, and adds a Launch Screen

Allow Gesture Recognizer To Function Simultaneously With Other GRs

This modification ensures that apps depending upon this library which
have other gesture recognizers in use during the display of
BEMSimpleLineGraphView will be able to utilize delegate methods
-lineGraph:didTouchGraphWithClosestIndex: and
-lineGraph:didReleaseTouchFromGraphWithClosestIndex:

Without responding to the UIGestureRecognizer delegate method changes
contained in this commit, the BEMSimpleLineGraphView delegate methods
are never called.

Update README.md

Updated project requirements

Merge pull request #122 from kattrali/duplicate-permanent-label-fix

Ensure permanent pop-up labels are not duplicated

Merge pull request #87 from gavinbunney/master

Split enableReferenceAxisLines into two properties

Fixed Issue with Color Background X-Axis and Frame

- See second part of issue #62

Update README.md

- Project clean up

Minor clean up

Deprecated two methods

lineColorForIndex & lineAlphaForIndex are now deprecated in preparation
of new update.

Support of graphView in UIScrollView

Thank you to @nmattisson for this addition to the graph. See issue #12.