Fixed Destruction Error Message and Improve UX

This pull request contains a series of tweaks and fixes. 

* This pull request has a fix where the user was not being notified after they asked the remote server to destroy their content.
* I made the content preview its changes when editing existing content.
* I fixed the styling on the text area so it is not resizeable.
* Text areas will now auto-resize to fit their contents when not being edited in-place. I used a jquery plugin to achieve this.
* I refactored the meta-loader to more easily conditionally load JS and CSS, depending on the context.