Updated text to point to MAEC 4.1/CybOX 2.1
Updated copyright year
Updated README with latest version and library info
Adds minor changes for consistency
Updates copyright year
Removed extraneous MAECNamespaceParser import
Merge branch 'maec4.1_update' of github.com:MAECProject/threatexpert-to-maec into maec4.1_update
ID generator-related updates
Removed redundant line in top-level comments
Updates for consistency
Removed authorship
Merge branch 'maec4.1_update' of github.com:MAECProject/threatexpert-to-maec into maec4.1_update
Merge pull request #1 from MAECProject/maec4.1_update

Updates for MAEC 4.1
Removed some dead code
Re-added directory handling
Updated __process_dirnames_notes_type for consistency with other methods
Updated __process_added_drivers_type to use file_path property for added driver file path
Updated some association_type values for accuracy
Removed all force_datatype entries