First cut at post edit form & populating form with real info

* Replace much of the edit view with real data
* Remove fancy input field swapping code
* Hide bits of the edit for we can't handle yet
* Update create post to share classes between create and edit
* Convert spaces to tabs in edit/create html
* Fix styling on fieldset switching buttons
Make location editor start with correct location when editing
Make editing post tags work

Store related models as IDs only in backbone. This matches the format
that backbone-forms uses and so tags select will now work.
Hide user fields on models where user is already set..
Hide 'lock' icon on posts list