Use timeout on Elements requests

[gravesm]

This statement will never be True: https://github.com/MITLibraries/solenoid/blob/master/solenoid/elements/views.py#L60 since requests will always return a response, raise an exception or hang indefinitely if no timeout has been provided to the request. The best thing to do will probably be to set a timeout on the request and catch any requests.Timeout exceptions.