Documentation Improvements

[langston-barrett]

I'd like to add considerably more documentation. It will take the form of a Github wiki.

Things to be documented:

• [x] General JSON structure
• [x] Detail on each check
  • [x] Inputs
  • [x] Outputs/description (when would this check fail?)
  • [x] Dependencies
• [x] Creating a Consul check configuration
• [x] Architecture of the software (and how to get started writing checks)

The README will then consist of the following sections:

• [x] Installation and usage
• [x] Dependencies (outline of how this works)
• [x] the rest