Fix add document modal
Trigger WYSIWYG destroy method before checking if a section is empty
'topics' => 'related_topics' in backbone note model
Tweak API filter for ElasticSearch searches

Still need to work on the proper mapping & searching techniques, but
this is closer. Makes all ES models have a display_title field which can
be relied to be searched on (for title matching). This is a multi-field
with a string type and an autocomplete type. I still haven't tamed the
latter so I'm not using it anywhere (yet).
Update (create) elasticsearch autocomplete fn
Use elasticsearch mixin in api/views/topics.py
Fix top search bar's autocomplete functionality

1. jquery-ui 1.9 introduced some accessibility improvements, one of
which is adding a message about navigating search results just after the
search input. That message is supposed to be hidden, but we don't use
jquery-ui's CSS file. I hidded it myself.

2. Top search bar now searches all items, not just topics. A label is
prepended to each result displaying the type of the result.

3. lil stylistic changes
Merge pull request #179 from editorsnotes/fix-editing-bugs

Small round of fixes for editing functions that were broken in the last big change