Arsalan's edits

[arsidada]

• Fixed formatting issues with go fmt and go vet -v
• Organized code to separate approvals API stuff from comments API
• Added comments to functions
• Updated comments API names to be just comments for both GET and POST calls. It's more convenient to use
• Updated API to not userid but use username instead. When using userid, the front-end app will have to figure out who this ID is by calling the FB or Google auth API and then show the name. This is highly inefficient. Instead if we store the username from when the comment was made, we can just return that when a GET comments call is made
• Updated comments POST API to accept the content of the comment via Body and not via Header. Using content in headers is against REST best practices