Fix reference to restler library in the Viadeo module.
Replace restler reference (no longer a dependency) with request library usage (current dependency).
Fix syntax error and remove OAuth 2 configuration details.
Fix Weibo module adding the fetchOAuthUser to the authCallbackErrorSteps sequence instead of the callbackPath sequence (helps address issue #366).
Merge pull request #367 from fruchtose/master

Fix Viadeo module interpretation errors (#366) and Weibo authentication