$Model->table replaced with $table where $table = $this->fullTableName($Model);
$table = $this->fullTableName($Model); occur 2 times in read function. Removed unnecessary one.
Use setReadPreference() if setSlaveOkay() is not available (as in Mongo driver 1.4+)
Merge pull request #92 from davehensley/cake2.2

Use setReadPreference() if setSlaveOkay() is not available
Merge branch 'cake2.2' of github.com:crlcu/cakephp-mongodb into crlcu-cake2.2