feat(jqmFieldcontain): Initial commit. Wrapper for label/form pairs.

While trying out some things, noticed that we dont implemented the fieldcontain wrapper. Didn't find any discussion on that, so i implemented it.

Usage:
```
    <div jqm-fieldcontain>
      <label for="name">Your Name:</label>
      <div jqm-textinput ng-model="name" />
    </div>
```