Programs documentation
Issuer documentation
System documentation
Badge documentation
Fixing `put` docs
Adding content-types and alternative request types
Noting unsupported image upload formats
Update badge docs with changes from #21
Updating program docs, incomplete.
Testing formatting.
More formatting.
Formatting.
Update programs API doc.
Update issuers API doc
Update systems API doc.
Fix formatting.
More formatting fixes.
Merge pull request #16 from mozilla/docs

First pass of API documentation