Merge pull request #214 from edi-bice/master

Fixed broken rate limiting error handling in archiver/follow.
Twitter changed rate limiting response objects quite a bit in v1.1.
In addition there were bugs due to import of time module and time object from datetime module.
urllib2 opener open lacked a timeout parameter causing it to hang indefinitely on certain URLs where the host does not send back any data - added timeout=1 for now and will expose as parameter later - also added socket.timeout exception to list of exceptions handled