Add core GitHub commands

[pcgeek86]

We need to fill out some of the core commands for interacting with GitHub.

Core

• We need to figure out how to handle data pagination

Authentication

• Support authentication in Microsoft Azure Automation runbook service, using PSCredential asset type
• Encrypt GitHub Personal Access Token on-disk in JSON configuration file
• Add support for multiple usernames and Personal Access Tokens
  • Enable user to switch between contexts
  • Enable user to specify a GitHub profile during each command call

Repositories

https://developer.github.com/v3/repos

• List the authenticated user's GitHub repositories
• List a specific user's public GitHub repositories
• List all public repositories
• Create new repositories
• Edit / modify properties of existing repositories
• Delete existing repositories
• List contributors
• List languages in project
• List branches
• Get a specific branch
• List Git tags on a specific repository

Pull Requests

https://developer.github.com/v3/pulls/

• View outstanding Pull Requests for an owner / repository
• Merge one or more Pull Requests (one PowerShell command)
• Update a Pull Request (title, description, state)
• Create a Pull Request

Search

https://developer.github.com/v3/search/

• Search for GitHub repositories
• Search for GitHub issues
• Search for GitHub users
• Search for code

Issues

https://developer.github.com/v3/issues/

• Create new GitHub issues
• Close or re-open GitHub issues
• List all or individual issues
• Lock and unlock issues

Milestones

https://developer.github.com/v3/issues/milestones/

• Create a milestone
• List all milestones
• Get a specific milestone
• Update a milestone
• Delete a milestone

[exactmike]

Pull request I posted today addresses:

• List the authenticated user's GitHub repositories
• List a specific user's public GitHub repositories
  I think with a little more effort and another parameterset we could also address
• List all public repositories