Modified GA behavior and added event tracking to gdrive repository
updates
Lightened note saving process steps and implemented autosaving in
onPause() callback of DetailFragment
Added stub for real tags, they'll be parsed direclt from text and
they'll behave as links.
Strings changed according with the new categories-tags dualism.
Refactored the strings and variables to mantain naming conventions with
the new "categories"
New tags implemented. They should be improved by showing the numer of
notes tagged with each tag
Implemented logical deletion of notes using a trash
Removed warning when trying to categorize notes without existing
categories, it was a misleading behavior
Added help online file
Merge remote-tracking branch 'origin/master'