Engineering Design Interface (EDI) Contrib Package

[codykarcher]

Fixes # N/A

Summary/Motivation:

This contrib is a light wrapper on the pyomo API that allows for alternative problem construction

Changes proposed in this PR:

• No major changes to base pyomo
• the .gitignore file has one update
• New documentation added
• New contrib package added

Legal Acknowledgement

By contributing to this software project, I have read the contribution guide and agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the BSD license.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[blnicho]

Next batch of comments. I'm still going through the code.