2.24.1
Add open source attribution.
2.25.0
2.25.1
2.26.0
2.27.0
Merge branch 'master' of github.com:braintree/braintree_python into python_3_beta

Conflicts:
	CHANGELOG.md
	braintree/util/http_strategy/requests_strategy.py
	braintree/version.py
	setup.py
	tests/integration/test_http.py
more comprehensive gitignore for python projects