Fixed namespace issue

Thanks Koc!
Fixed application display name

Thanks Koc!
Removed default constructors for Fragments

Thanks Koc!
Updated text in AboutFragment
made POI navigation group expanded by default and not clickable
Update to AboutFragment layout
Enabled filtering of the POI adapter

Implemented the Filterable interface, allowing to perform filtering on
all POI fragments.
Forgot to commit new dimensions used in fragment_about.xml
Enabled content filtering in POI fragments

Enabled filtering using SearchView and the updated POI adapter.