Updated Namespace Parser for MAEC v4.0.1
Updated bindings to account for schema_version attributes being updated to strings instead of floats in MAEC 4.0.1
Updated schema_version in Bundle to a default value of 4.0.1
Updated schema_version in Package to a default value of 2.0.1
Corrected last update datestamp
Updated schema_version in Package to a default value of 2.0.1
Updated version to 4.0.1.0
Updated install_requires for python-cybox versions corresponding to v2.0.1