Annotation Tools: Turn off Private/Public option and add missing css group to MyNotes

**Background:** With the last push for the annotation tool I moved css files into a group so they would only be loaded in the templates used for the components instead of everywhere in the LMS or CMS. I missed out on MyNotes. We are also running into some issues in our annotation server backend so we are disabling the options to make things Private or Public (got the okay for the courses going live in a week). Everything will now default to public since the point of the courses is to share annotations.

**Studio Updates:** None.

**LMS Updates:** Added the css group to one file and then turned the Permissions checkbox from ```true``` to ```false```. Added check to make sure grouping exists so that "My Notes" works as intended.

**Testing**: What MyNotes looked like before: 
![Broken MyNotes Page](http://i.imgur.com/tTa9l34.png)

What it should look like (once you make annotations):
![Fixed MyNotes Page](http://i.imgur.com/pbZQbID.png)

What the editor looked like before:
![With the Permissions](http://i.imgur.com/uM00CLO.png)
What the editor should look like now:
![Without the Permissions](http://i.imgur.com/fBZwvVI.png)

The following [tarball](https://www.dropbox.com/s/phc0b08e6grtcdm/20014_T4.u1SV2n.tar.gz) contains units with the annotation tools (text, video, image). It also contains a new tab above that says "My Notes". From now on, any annotations made in text, video, or images will appear in the "My Notes" tab as a way to amalgamate the notes. To test the above, go into any (as many as you want) unit and add a comment. Check to see that the permissions button now is *not* available. Then go to My Notes and see that your notes appear there. 
@lduarte1991 The most inward if block can be simplified as follows:
```javascript
if (typeof this.annotator.plugins.Grouping !== 'undefined') {
    this.annotator.plugins.Grouping.useGrouping = this.current_tab === 'public' ? 0 : 1;
}
```