Allow args to be passed through to ArgumentParser.parse_args
Fix issue with --rename. Construct the dict from pairs collected in the parser.
Merge with refactor
Pass a function to alter the cursor such that oplogReplay isn't called during a simple 'query_oplog' call
I meant rename, not replace
Merge fix in refactor
Use items for Python 3 friendliness
Replaced functional implementation with object-oriented implementation

--HG--
extra : amend_source : e45d6d9be9d8fbd377b826d5e5e4762d2521ee52
Only set the cursor to tailable when tailing is indicated.
Merged with tailable