Added UIImage category to apply noise to any image
Added a UIColor category
Make sure both categories play nice with Retina displays
Added a mask to the image category
Removed rand and srand fix #8
Merge https://github.com/Vortec4800/KGNoise into Vortec4800
Added the image noise categories to the main KGNoise file so there is only one thing to add. Also implemented the image category for NSImage and added examples to the sample apps.

fix #2
Updated readme: info about the image categories
Add autoResizing support to the iOS example
Set KGNoiseView's default contentMode to UIViewContentModeRedraw

Per UIViewContentModeRedraw: "Redisplays the view when the bounds
change"
Merge pull request #11 from danielamitay/master

Add autoResizingMasks to the iOS example, and set KGNoiseView to redraw upon bounds change