Rating directive that will take care of visualising a star rating bar.

• ng-model : The current rate.

• max (Defaults: 5) : Changes the number of icons.

• readonly (Defaults: false) : Prevent user's interaction.

• on-hover(value) : An optional expression called when user's mouse is over a particular icon.

• on-leave() : An optional expression called when user's mouse leaves the control altogether.

• state-on (Defaults: null) : A variable used in template to specify the state (class, src, etc) for selected icons.

• state-off (Defaults: null) : A variable used in template to specify the state for unselected icons.

• rating-states (Defaults: null) : An array of objects defining properties for all icons. In default template, stateOn & stateOff property is used to specify the icon's class.