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>
Add update mode documentation

Fix #5. This add some documentations for the new update mode and
options for model dumping.
This also update the history file for preparing for the new release.

Signed-off-by: Thomas Lavergne <thomas.lavergne@reveurs.org>
Release v1.5.0

Signed-off-by: Thomas Lavergne <thomas.lavergne@reveurs.org>
Merge pull request #1 from Jekub/master

sync with upstream