Coma separator handling in greaterThan and lessThen validators

As in title.

My scenario:
```
<input class="form-control" name="weight" data-bv-notempty="true" data-bv-numeric="true" data-bv-numeric-separator="," data-bv-greaterthan data-bv-greaterthan-value="0">
```

Works as with dot separator. Tested with units.