Cross-origin request to rawgit.com vs raw.github

Chrome or github seems to have changed security/embedding policies.
rawgit.com serves as a proxy to raw.github.com with correct mime-types
and flexible cors headers.

Without this change, chrome produces an error message like:

XMLHttpRequest cannot load
https://raw.githubusercontent.com/mikeal/tako/master/package.json. The
'Access-Control-Allow-Origin' header has a value
'https://render.githubusercontent.com' that is not equal to the supplied
origin. Origin 'chrome-extension://gjfoekeijnfcemfgihckkhhoiehljdmd' is
therefore not allowed access.
'.bubble.files-bubble' no longer exists.

Long live '.file-wrap'
Commit built files.