In order for us to continue to dual-license our Canvas product to best serve all of our customers, we need you to sign our contributor agreement before we can accept a pull request from you. Please read our FAQ for more information.
To save yourself a considerable headache, please consider doing development against our master branch, instead of the default stable branch. Our stable branch is occasionally reforked from master from time to time, so your Git history may get very confused if you are attempting to contribute changesets against stable.