Mongo API to return write result

Merge pull request #6 from safetrax/mongoapi/givebackwriteresult

Mongo api to give back the writeresult

Release version 0.2.1

Jetty dependency upgraded to 9.3.6.v20151106
Mongo java driver upgraded to 3.2.1

First beta release on maven central

Beta release of mongorest on maven central.