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

[marcheiligers]

• 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 ;)

[igrigorik]

Added tests to check that both old and new style can be loaded

Hmm, do we actually want that? Generally, I'm not a fan of carrying this kind of stuff forward -- makes future work unnecessary complicated. I understand the issue of broken upgrade, but to address this, we could provide a different tool to perform the conversion (if you such thing). Thoughts?

[marcheiligers]

From my angle, I've got several million records stored in a Riak cluster that are taking up far too much space. I'd like to silently upgrade and not worry about 'em. I don't believe the code added to handle this has any performance impact.

Also I'm a big fan of backwards compatibility ;)

[igrigorik]

@marcheiligers it's not performance impact, as much as unnecessary anchors / code moving forward. With that said, I guess it's not too big of a hurdle here.