move quote to utils
use raw.github for files

github api doesn't serve files larger than 1MB
blob no longer redirects to tree
fix github redirect to tree/blob
don't fail on memcache errors
restore old multipart memcache behavior
Merge pull request #123 from minrk/raw-api

back to raw.github.com

we can't rely on api.github for files, because it won't serve files over 1MB.

closes #122