Change color of selected menu item

@stevesherrie please review. 

The idea here is that `$rootScope.navSelected` is updated in main application every time router state changes. Example:
```
$rootScope.$on("$stateChangeSuccess", function() {
  $rootScope.navSelected = $rootScope.$state.current.name;
});
```
The second part of the magic is that `$rootScope.navOptions` includes definition if states that correspond to the menu item. `states` field is optional. Example:
```
$rootScope.navOptions = [{
  title: "Store",
  link: $state.href("root.common.products"),
  states: ["root.common.products"]
},
{
  title: "Account",
  link: $state.href("root.common.account"),
  states: ["root.common.account"]
},
{
  title: "Platform",
  link: "http://rva.risevision.com/",
  target: "_blank"
}];
```
See also https://github.com/Rise-Vision/common-style/pull/82. This is where `selected` CSS style is defined.

@nexus-uw @alex-deaconu @settinghead FYI