Update SHA for xblock-submit-and-compare
Update SHA for xblock-submit-and-compare

This commit brings the stanford dependency
on xblock-submit-and-compare to the most recent version.
The current version adds the following features:
1) Tox framework to execute tests and measure coverage
2) Ability to set the maximum number of allowed attempts
3) The ability to set the weight of a problem to 0

caesar2164/edx-platform,caesar2164/edx-platform,caesar2164/edx-platform,Stanford-Online/edx-platform,Stanford-Online/edx-platform,Stanford-Online/edx-platform,Stanford-Online/edx-platform,caesar2164/edx-platform