Some warnings fixed

Pull request merged that solve some compile warnings

New tag for cocoa pods

New tag to enable cocoa pods update.

Bugs fixed and improvements

• App state aware fixed.

x100 times faster than previous release

• Interface has been updated with sync and async new methods. However, I kept all interface.
• We added a dependency, now uses OpenGLES.
• The algorithm has been modified so you will notice different resultant colors.
• Using OpenGLES I increased the performance 100 times
• Now the demo uses a synchronic method.
• LEColorPicker run faster in devices than simulator.