enqueue image urls, rewrite img src to be abs, and add screenshot service
delete old files
-a
Merge branch 'master' of git://github.com/hankya/questions

Conflicts:
	exampapers/middlewares/httpproxy.pyc
	exampapers/middlewares/retry.pyc
	exampapers/pipelines/djangowriter.pyc
	exampapers/questionmodels/models.pyc
	exampapers/settings.pyc
	exampapers/spiders/cooco.pyc
	exampapers/spiders/jyeoo.pyc