DOC: Write little about DB saving/loading.
LIB: Add ready status to the players. Implement ReadyPlayers notify, request and response.
DEMO: GTKmm3: Implement changing ready status.
DEMO: Qt4: Implement changing ready status.
LIB: Protocol changes implemented and freezed. Version bump.
Added tag 0.0-alpha2.0 for changeset a7f2d9e65d48