Allow Native::marshal_load to load "old style" marshal_dumped bloomfilters

- Fixed various compile time warnings and silenced output during tests
- Updated CBloomFilter `bf_load` to check string size and load old style if needed
- Added tests to check that both old and new style can be loaded
- Added a getter to return the options for an instance
- Took a chance and bumped the minor version number in the hope this will be released ;)