Feature/ngui doublerange fix

input[type=range] behavior changed with angular 1.3

this PR fixes doublerange directive, but at same time gives up on using html5 mode in coopr because that UI is not practical for the end user.
it would be have to be done like this:
```
<my-doublerange
  data-html5 ="{{html5mode}}">
</my-doublerange>
```