fix(ui-sref): Allow sref state options to take a scope object

The tests pretty well outline the problem. Look at them if you want to see what is accomplished.

Basically when you try to use an object on a scope as your parameters for ui-sref. On a digest churn no updates occur. This fixes that problem.

```
$rootscope.scopeVar = {a:'1',b:'asd'}
ui-sref="something.something(scopeVar)"
```