acquireOAuthRequestTokenWithPath: method should check for oauth_error_message string in response

[nnhubbard]

An OAuth client I am using sends errors back within the success block of acquireOAuthRequestTokenWithPath:.... Should we just check for an occurrence of the oauth_error_message string then return an error if it is found?

[mattt]

With 84d3bb8, AFOAuth1Token objects have a userInfo property, which captures any non-standard parameters sent by the server (such as oauth_error_message).