added time to live (TTL) function: mongo.index.TTLcreate (#40)
Merge pull request #55 from dselivanov/master

Fetching improvements and bugfixes for appending raw data to bson. Bson construction improvements.
Merge pull request #56 from stanstrup/master

added time to live (TTL) function: mongo.index.TTLcreate (#40)
fixes mongosoup/rmongodb#34