Fixed support for "Bearer" and "Token" auth-schemes.

Removed the test for "Authentication: Bearer Token <TOKEN>" which was not supposed to exist (see https://github.com/channelcat/sanic/pull/821)
Also added a call to `split` when retrieving the token value to handle cases where there are leading or trailing spaces.

sanic/request.py

@@ -86,13 +86,13 @@ class Request(dict):
 
         :return: token related to request
         """
-        prefixes = ('Bearer', 'Token ')
+        prefixes = ('Bearer', 'Token')
         auth_header = self.headers.get('Authorization')
 
         if auth_header is not None:
             for prefix in prefixes:
                 if prefix in auth_header:
-                    return auth_header.partition(prefix)[-1]
+                    return auth_header.partition(prefix)[-1].strip()
 
         return auth_header