Space configuration tests

[rpspringuel]

There is currently no test specifically for loading space configuration files. Adding one requires having a gsp-sample.tex file in the test folder and I that runs into problems with how the test harness identifies the test file (same extension as a test file). @henryso, is it possible to add an exclusion for gsp-* files so they don't get picked up as tests to be compiled?

Corresponds to gregorio-project/gregorio#1467

[rpspringuel]

Figured out how to exclude gsp-sample.tex from the test list. At this point I've only excluded that single filename, rather than the class gsp-*.tex. If we decide to add more tests which use gsp files, then we can expand the exclusion.

[rpspringuel]

Done.

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