Codebase (MainActivity views)

Amended the presentation of the MainActivity fragments. Look's more
consistent (flow); however may change mind.
Codebase (Session fragments)

Amended the presentation of fragments in Sessions. The visual
presentation communicates the information much more effectively.
Codebase (Settings)

Added a new heading to the Settings view (About fragment).
Codebase (Settings)

Added some string resources in values.xml for About fragment.