Add simpler Session constructor

Use DefaultMessageComparator by default.

Signed-off-by: Jussi Virtanen <jussi.virtanen@valotrading.com>
Take simpler Session constructor into use

Signed-off-by: Jussi Virtanen <jussi.virtanen@valotrading.com>
Merge pull request #127 from jvirtanen/features/simpler-session-constructor

Add simpler Session constructor