Nicer way to manipulate the OAuth header. Thanks Toby White.

git-svn-id: https://oauth.googlecode.com/svn/code/python@1068 f7ae4463-c52f-0410-a7dc-93bad6e629e8

Author: leah.culver

oauth/oauth.py

@@ -231,8 +231,8 @@ def from_request(http_method, http_url, headers=None, parameters=None,
         if headers and 'Authorization' in headers:
             auth_header = headers['Authorization']
             # Check that the authorization header is OAuth.
-            if auth_header.index('OAuth') > -1:
-                auth_header = auth_header.lstrip('OAuth ')
+            if auth_header[:6] == 'OAuth ':
+                auth_header = auth_header[6:]
                 try:
                     # Get the parameters from the header.
                     header_params = OAuthRequest._split_header(auth_header)