Added play and pause icons (courtesy of http://www.flaticon.com/)
Added a play / pause button to the slider. This will need repositioning.
Put the icons in an appropriate position on the slider.
Renamed function to toggleAutoplay for clarity.
Is slider is now brushed, autoplay will be flagged as false.
Moved the autoplay functionality into a service - this avoids the need to use the parent scope in the directive (dodgy coupling).
Merge pull request #28 from daveallenbpm/play_and_pause_icons_for_slider

Play and pause icons for slider