Rename from Cumulus to Nonprofit Start Pack

This branch modifies the build scripts to use the new cumulusci.package.name.managed property when deploying against the packaging org.  This allows us to keep the Cumulus package in all unmanaged deployments but rename the package to Nonprofit Starter Pack in the packaging org.

# Warning

# Info
* Changes the package name from Cumulus to Nonprofit Starter Pack in the Installed Packages list

# Issues
Fixes #884