Merge pull request #44 from antonbobukh/master

Positional update of inner DBObject field is fixed
bad skip, doesn't respect filter
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
add getMongoClient to Fongo
refs #40 simple unique indexes
simple aggregator for min/max/last/first
 and  must handle null
clean import
add extractField on Util
Merge branch 'utilExtract' into minmax
add containsField on Util
Merge branch 'utilExtract' into minmax
use Util for containsField and get
simple rename for
more complex case in , need refactoring