Remove warnings about bindings

After updating ember.js ember-easyForm was generating warnings like:

“Warning: You're attempting to render a view by passing
propertyBinding=view.property to a view helper, but this syntax is
ambiguous. You should either surround view.property in quotes or remove
`Binding` from propertyBinding.”
Merge pull request #54 from fusionbox/fix-warnings

Remove warnings about bindings