add create_rounds migration
remove the commented-out portions of the migration
modify seeds file to not depend on a time_period reference in the Card model
add Round model
add association to round table in the Game model
run migration and update schema
remove empty method body in PagesController
create factory for Game model
create factory for the Round model
add tests for Card, User, and create new tests for the Round model
add delegations to the Round model to simplify retrieving players from a Round instance
Merge pull request #33 from raccoons-2014/rounds

Everything looks good. Merged.