Since Mustache implementations should strive to be template compatible, this change adds basic compliance testing against the formalized Mustache Spec. This is currently set up against v1.1.2 of the spec, without support for the optional lambda module.
Adding a submodule reference to the Mustache Spec.
Adding a script to test spec compliance.
How could this be integrated into the test suite that gets run when we run rake?
Closing this as #301 was merged which fixed testing against the spec