Fix memory bug in quark database

Missing star which can lead to wrong allocation size.

Signed-off-by: Thomas Lavergne <thomas.lavergne@reveurs.org>
Fix bigram feature bug in raw mode

Fix #7 by disabling selection of the maxent code path for raw mode when
no bigram patterns are provided.

Signed-off-by: Thomas Lavergne <thomas.lavergne@reveurs.org>