Merge pull request #35 from pnml/master

update mongo-java-driver to 2.11.1
WriteConcern on mongo propagates to collection

closes #34
getting ready for 1.1.0 release
[maven-release-plugin] prepare release 1.1.0
[maven-release-plugin] prepare for next development iteration
Fix for regex $options parsing

Thanks @izmailoff, was using wrong bit operator

closes #36,#37
Fix for mysterious NPE

closes #27