Merge pull request #19 from kostya-viktorov/master

SharedPreferences and Categories CheckBoxes working together.
Merge pull request #20 from kostya-viktorov/master

Categories, Tags, Settings
Added an About Us activity
merged?
Merge pull request #22 from dgiovann/master

Added About Us activity
clear old, and clear favorites
merged
Merge pull request #9 from praccu/master

Updating