fix(lib): use hyper Bearer header style

Considering we kind-of hardcoded this authentication type anyway,
we now use the Auth-types provided by hyper 0.8.

The incentive here was the compiler telling us that there the
yup-oauth::Scheme type doesn't implement the hyper::authorization::Scheme
anymore, even though that clearly was the case. Also it couldn't be
reproduced in yup-oauth itself.

This will need some work to get correct again, so this is just a crude
patch to make it work again.

src/rust/api/cmn.rs

@@ -10,7 +10,7 @@ use mime::{Mime, TopLevel, SubLevel, Attr, Value};
 use oauth2::{TokenType, Retry, self};
 use hyper;
 use hyper::header::{ContentType, ContentLength, Headers, UserAgent, Authorization, Header,
-                    HeaderFormat};
+                    HeaderFormat, Bearer};
 use hyper::http::h1::LINE_ENDING;
 use hyper::method::Method;
 use hyper::status::StatusCode;
@@ -632,7 +632,7 @@ pub struct ResumableUploadHelper<'a, A: 'a> {
     pub start_at: Option<u64>,
     pub auth: &'a mut A,
     pub user_agent: &'a str,
-    pub auth_header: Authorization<oauth2::Scheme>,
+    pub auth_header: Authorization<Bearer>,
     pub url: &'a str,
     pub reader: &'a mut ReadSeek,
     pub media_type: Mime,