Issues typesetting GregorioTeX examples

[ktraunmueller]

Matt reports he's running into issues typesetting the example from GregorioTeX: http://gregorio-project.github.io/gregoriotex/example.html

A quick glance into the log shows some luatex warnings and issues with loading .tfm files.

Compositor log:

• com.microlarge.Compositor 2018-04-03 20-31.log

Example files:

• http://gregorio-project.github.io/examples/O_Antiphons/O_Antiphons.zip