Fixed notices & errors thrown when global error catching is enabled

Immediately when I started to use Restler I got off put by notices thrown caused by error suppression. I've changed the code which caused problems for me, removed the error suppression and so far it's working. I don't want to go all philosophical, I just don't believe there is a single good case where the @ operator makes sense, check out this SO question and the second answer: http://stackoverflow.com/questions/136899/suppress-error-with-operator-in-php