Using the --debug flag or the GLANCECLIENT_DEBUG env var, a user will
see http requests and responses in great detail. Requests are formed
into proper curl commands while responses are printed just as they would
as if the curl request provided were executed. Response bodies will not
be printed if they are application/octet-stream.
Change-Id: I9c9c5d6ec9f481091c944e596d073da3739795b6