Fixed bug with attribute 'timeout'

  File "./apns.py", line 139, in _connect
    self._socket.settimeout(self.timeout)
AttributeError: 'GatewayConnection' object has no attribute 'timeout'
Merge pull request #56 from ogreser/fixing_timeout_bug

Fixed bug with attribute 'timeout'
Fixed bug with missing SSLError in imports

  File "/usr/lib/python2.6/dist-packages/apns.py", line 153, in _connect
    except SSLError, ex:
NameError: global name 'SSLError' is not defined
Merge pull request #62 from ogreser/fix/SSLError

Fixed bug with missing SSLError in imports