1.1.1 - Thumb image size fixes

Thanks @vvit and @jegumhon

1.1.0 - Images from a custom bundle on iOS 7

Load images from custom bundle on iOS 7 #28 Thanks @ikovalisko

1.0.1 - Left/right thumb views

• Exposes read-only properties of left/right thumb views #22, thanks @ashfurrow

1.0.0 - Range Slider

• Fix double initialisation.
• Use image height as track height.
• Drop hardcoded image insets.
• Calculate intrinsicContentSize.
• New way of setting minimum/maximum and left/right values.
• Load images from a bundle.

Pushable controls

1. Possibility to have pushable controls.
2. Disabling overlapping of the thumb controls.

Big thanks to @Arrnas for contribution.