Kellyroach/tapgesture

[kellyroach]

This pull request

• Adds a tap gesture recognizer to the demo app so that
  whenever the user taps the screen, the user is welcomed with a new
  random conical gradient. This is the same behavior which was and still is
  available by rotating device twice, e.g. portrait -> landscape -> portrait .
• Adds an AppIcon and LaunchImage to the demo app.
• Fixes repo issue startAngle/endAngle Behavior
  startAngle/endAngle Behavior #3

[tadija]

Hi @kellyroach, thank you for your efforts, but I've decided not to merge this.

The thing is that I like better how gradient looks before your changes:

then after:

Also #3 may be fixed with just configuring locations properly:

which also looks differently after your fix:

P.S. Thanks for the tap gesture hint, I've added that to the example project!