Added Trimming Methods & tests to NSString category
Added Trimming Methods to NSString category
…t. If you were subclasses SSGradientView and overriding `drawRect:`, this will break your subclasses. Overridding `drawRect:` will cause the gradient not to draw. It is recommended to add another subview on top of the gradient. This change will draw the gradient with the GPU instead of the CPU for better performance. This also allows for more than 2 colors.
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