Rating directive that will take care of visualising a star rating bar.
<uib-rating>ng-model : The current rate.
max (Defaults: 5) : Changes the number of icons.
readonly (Defaults: false) : Prevent user's interaction.
titles (Defaults: ["one", "two", "three", "four", "five"]) : An array of Strings defining titles for all icons
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.