Replace raco submodule with install/develop about myria-web HOT 2 OPEN

The problem was app engine, right?

from myria-web.

Yes, it's been a while since I looked at this, but I think GAE restrictions on third-party libraries were the original reason for including raco as a submodule. We might be able to install it via pip using a lib directory under the GAE root directory: https://cloud.google.com/appengine/docs/python/tools/libraries27?hl=en#vendoring. Per the instructions on this page, we would add the following to appengine_config.py:

from google.appengine.ext import vendor

# Add any libraries installed in the "lib" folder.
vendor.add('lib')

Then we would add the desired raco version to requirements.txt and run pip install -t lib -r requirements.txt before deploying.

from myria-web.