New

Added new hideLabels property to hide the labels on the slider. Previously the suggestion was to set the formatter override to [NSNull null]. This was bad. Especially for Swift. Now you should set hideLabels to true instead. The old method will work for now too though. (thanks Aaron Connolly!)
Added custom handle image or custom handle colour - handleColor and handleImage properties (thanks fiantinangon and ClaudioTSM!)
Added custom line colour for the slider line - sliderColorBetweenHandles (thanks fiantinangon and ClaudioTSM!)
Added custom line height for the slider line - lineHeight (thanks ClaudioTSM!)
Added custom handle diameter for the size of the slider handles - handleDiameter (thanks ClaudioTSM!)
Added property to control how much the handle zooms by when it is selected by the user - electedHandleDiameterMultiplier (thanks ClaudioTSM!)
Added new delegate method didEndTouchesInRangeSlider (thanks andreyvit!)
Added new delegate method didStartTouchesInRangeSlider (thanks holgersindbaek!)
Made the delegate property an IBOutlet (thanks felipowsky!)
Added minLabelFont and maxLabelFont properties to change the fonts of the labels (thanks codiophile!)

Fixed Bugs

Do not try to prevent labels overlap when disableRange == YES - Without this fix, the maxLabel would not go all the way to the left due to the minLabel being accounted for even if hidden. (thanks JonathanTron!)
Fixed label spacing bug from #2 (thanks krychlinski for reporting and relevante for the fix!)
Fixes a problem where TTRangeSlider would not always inherit the tintColor of the parent view when using Interface Builder (see #25 for details - thanks guillaume-algis!). Related: tintColor is only respected if a custom handleColor has not been set (thanks felipowsky!)