AngularJS trimming/maintenance

- Removed unused/unnecessary files.
- Removed unused column in Notes table.
- Changed loggedIn flag to object in attempts to make ng-show work (in
progress)
- Added a method to change the loggedIn flag when the user clicks log
in/out (in progress - not working)
- Removed unused methods from mainController.js.
- Moved the tinymce script to index.html in attempt to make the text
editor work again (in progress - not working).