Version 1.2.1

• Now uses colorlog instead of coloredlogs for CLI log colorization, as this fits better with COT's logging model.
• Now PEP8 compliant - passes validation by flake8 code analysis
• Very preliminary support for OVF 2.x format
• Greatly improved unit test structure and code coverage, including tests for logging.
• Now uses tox for easier test execution and coverage.py for code coverage analysis.
• Code coverage reporting with Coveralls