Various fixes:
- Remove useless select calls - regular files are always ready for reading
- Bump urllib2 timeout to 10 seconds
- Pass on urllib2.HTTPError codes to apache
- Handle urllib2 timeout exceptions
- Call sys.stderr.flush() properly
- Use 4k buffers
- Add some logging for now
- Always seek to the start of the file
- Abort slave if master goes away
- Add sleep to slave to keep from spinning when caught up to master