Added SVActivityIndicatorView

It’s a subclass of UIActivityIndicatorView that takes UIImage Array for
custom activity animation.
Added demo for SVAnimationIndicatorView
Changed Framerate parameter

Changed from Framerate parameter to Duration in seconds, more natural
updated demo
changes default custom loader images

added a more generic loader
Added tint-able UIImageView animation

Using NSTimer to tint UIImageView image animation. For tint to work,
load images with UIImageRenderingModeAlwaysTemplate enabled. Then set
the tintColor of SVActivityIndicatorView

Updated demo on to demonstrate custom views for pulltorefresh