Update along with changed Relation type.
Update around placeholder propagation.
Update along with around placeholder.
fixed errors that cabal check reported
Merge branch 'rel-20130605' of github.com:khibino/haskell-relational-record-driver-sqlserver into khibino-rel-20130605
fixed errors that cabal check reported
followed the change of module name
added test scripts
added support for composite primary keys
removed unnecessary dependency
commented out the unused columns
reconsidered which functions should be exported
removed unnecessary direct dependencies