allow player class to find unrostered players
update player url scope for unrostered players
remove tournament#teams methods
allow team instances to be fetched by flight_stage_id
revert player urls to roster players only (changed in previous commit)
add season player methods
removed tournament team test
fix season remove player url
add season player test
Merge remote-tracking branch 'origin/master' into unrostered-players
revert to master players
Merge pull request #132 from sportngin/unrostered-players

Unrostered players