prefer the value returned by x_avatar_url over building a gravatar URL
github avatar URLs support the same size argument as gravatar URLs
Merge pull request #2314 from gittip/elsewhere-avatars

Update handling of elsewhere avatars
Bump version to 12.6.1
Bump version to 12.6.1-dev
Change all blockchain.info URLs to https.
Merge pull request #2320 from xnyhps/https-blockchain.info

Change all blockchain.info URLs to https.