Clarify usage output
Clarify usage output

Ignore-this: 3ae12d273655c5f9024faab3ce1f6710

darcs-hash:20101109032144-e018d-b9df187814fd663ce44bd71bc569f257dca273a9.gz

creswick/dbmigrations,anton-dessiatov/dbmigrations,nathankot/dbmigrations,nick0x01/dbmigrations,jakubfijalkowski/dbmigrations