missing a synchronized
correct scalatest to run with the good classpath
Merge pull request #46 from twillouer/master

bad skip, doesn't respect filter
Merge pull request #47 from twillouer/multithreaderrors

error on multithreading
Merge pull request #48 from twillouer/scalatests

correct scalatest to run with the good classpath
Default to WriteConcern.ACKNOWLEDGED

thanks @shollander. closes #45