Complete rewritten of the library

feat( animation ): Pulse
feat( state ): Introducing state, to work with different checkbox states
feat( scale ): Added support to make checkbox bigger
feat( SVG ): Added support for svg elements,files and sprites
feat( Image ): Added support for tiny images
feat( lock ): Similar to disable but looks like active [ #17 ]
feat( Switch ): New iOS style switches with 3 variants

refactor( core ): All class names starts with prefix p- except prettyand state

fix( core ): z-index is calculated from 0 to 2 [ #6 , #14 ]

build( CI ): Setup Travis for auto publish from staging to master

doc( readme ): Updated with examples, badges, gif preview and a logo
doc( readme ): Removed bower installation guide
doc( readme ): Changed CDN provider from cdnjs to jsDelivr