Fixed wildcards in file exclude config

[pcantrell]

The exclude config option is clearly intended to support wildcards, but they weren’t working because:

• the crucial call to fnmatch? passed the arguments in the wrong order and
• one of them was a Pathname instead of a string.

This PR makes wildcard excludes work as expected. The corresponding specs update adds a regression test for wildcards.

The specs were not passing when I checked them out. I just regenerated them to match what jazzy was producing without further investigation. Here’s what changed.

[pcantrell]

Once this is merged, somebody should check whether it helps with #619.

[pcantrell]

YOLOOOOO