fixes for MongoDate

fixed serialization and negative timestamp support
fixes #40
Merge pull request #41 from Pomyk/mongodate_fixes

fixes for MongoDate
added https://github.com/koubas/mongofill/wiki/Supported-Libraries
Fix TestCase @return annotations namespace
MongoCollection methods aggregate, distinct, group and MongoClient method getCollectionNames
Merge branch 'master' of github.com:koubas/mongofill
killCursor WOP
Implemented MongoClient::killCursor()
Merge pull request #42 from koubas/killCursor

MongoClient::killCursor()