Provide a pip-6.0 agnostic setup.py example

  - Pip 1.5.6 -> 6.0 has a breaking change for parse_requirements.
  - Use a manual requirements split to support pre and post pip 6.0 for now.
Merge pull request #45 from evansde77/feature/pip-6.0-agnostic-setup-example

Provide a pip-6.0 agnostic setup.py example