Labels are now listed in the navigation view, to directly view notes of a specific label
The amount of labels displayed is limited to 10, if there are more than 10 Labels another navigation menu item with "X more" is displayed to indicate it
Refactored the Labels View to show proper Edit/Delete buttons instead of relying on Long Click menu to popup, which I find unintuitive
Moved the App version text to the bottom of the Settings Fragment
Closes #49