Use functools.wraps for decorator
Added more python versions to tox and travis
Document raising of EnvironmentError
Merge pull request #3 from aragilar/use_wraps

Use functools.wraps for decorator
Merge pull request #4 from aragilar/test_more_python_versions

Added more python versions to tox and travis
Merge pull request #5 from aragilar/document_exception

Document raising of EnvironmentError
Added support for PKG_CONFIG env var