implement createCollection(), createIndex(), hasIndex(), dropDatabase() on CMService_MongoDb
drop mongo db on forceReload in setup
add collections- and index-creation mechanism
tie mongodb clear to regular db clear;
empty collections instead of dropping them;
ensure creation of mongo-resource folder
remove second, identitcal if-clause
implement CM_Service_MongoDb::existsCollection(); make collection names unique to each test; remove unneeded tearDown()
Merge pull request #1394 from alexispeter/mongo-setup

Mongo setup