Sort notebooks & tags

Hi there,

I really love the project idea, i think it is great to have an open source alternative for Evernote and similar notetaking programs. And I would like to contribute a little cleanup for the user interface: 
* Make the notebooks sortable by their name or by when they were created (in settings form).
* In the 'add' and 'edit' form sort the options for the notebook parent by alphabet.
* Make the tags sort alphabetically by default.

What's missing? 
* I still need to add the unit tests for the sorting.

This is my first open source contribution, so I would be really happy if you reviewed my code and provided me some feedback.

Kind regards, Brian