[Fix #557] Don't load configuration files for excluded files.

When searching recursively for files to inspect, exclude files based on the Excludes parameter for the directory where the search started. The Excludes parameter value would have come from that configuration anyway, but it's best to avoid loading configuration within directories of excluded files.
Merge pull request #559 from jonas054/change_exclusion

[Fix #557] Don't load configuration files for excluded files.