Cyclomatic complexity Analyzer

[mothran]

Implement a analyzer that generates the cyclomatic complexity for each function in the binary. Because we have both blocks and followers / leaders we should be able to create a mapping for each function of 'linked blocks' as a set of pairs. The pairs might need a custom compare method that ignores ordering.

Currently we don't have a solid way to run analyzers 'for each function' so that will need to be implemented as its own analyzer class first. This might be worth holding off until all analyzers are in the event model.