First code review comments

[rantav]

There's no good way to leave comments in code, so I'll leave them all here

• The doc.go file looks like a copy of the readme file. First you need to update it. Second - is there a way to automate that?
• in IsErrorStruct you should use a type switch instead of iterating over an array of string with reflect.TypeOf(x).Name{}
• in glide.yaml, testify should be a testImport
• statusCodeToStruct has a switch inside a switch. Rubs me the wrong way. I would extract a function out of the internal switch
• This doesn't look right

	case http.StatusForbidden:
		var badRequest InvalidFormatResponse

• Line 78 has commented out code // err = json.Unmarshal(body, &result)