Updated VulnerabilityExploitType to ExploitType based on v4.1 changes
Refactored to use TypedField implementation
Merge branch 'master' of github.com:MAECProject/python-maec
Updated Entity to fix handling of TypedFields when no type is specified; replaced TypedField class with import of TypedField class from cybox
Bumped up version to 4.1.0.6