auth: context.go diff

Render JSON errors. Start rendering JSON errors when obtaining an access token doesn't succeed.

     1.1 --- a/context.go	Fri Aug 01 23:54:30 2014 -0400
     1.2 +++ b/context.go	Sun Aug 03 02:06:50 2014 -0400
     1.3 @@ -12,6 +12,9 @@
     1.4  func (c Context) RenderError(w io.Writer, err error) {
     1.5  }
     1.6  
     1.7 +func (c Context) RenderJSONError(w io.Writer, code, description, baseURI string) {
     1.8 +}
     1.9 +
    1.10  func (c Context) RenderConfirmation(w io.Writer) {
    1.11  }
    1.12

auth

auth/context.go