Fix for interpolated ui-view names

Fixes #1324

Allows scope variables to be used in the name attribute for a `ui-view`.
This allows `ui-view` to be used alongside directives such as `ng-repeat`.

Test results: 
> PhantomJS 1.9.7 (Mac OS X): Executed 220 of 220 SUCCESS (0.882 secs / 0.738 secs)