add t_fs_traversal testcase
add OpenSSL dependency to the unittest binary
scaffold and first test case to test file system traversal
test a full tree traversal
add test to ignore specific file names
make EXCEPT_* in Checklist more verbose
add a directory to the ignored list in IgnoringTraversal
add a test verifing the user steered recursion into directories
adding some symlinks to the test setup
Merge pull request #147 from reneme/test_fs_traversal

TEST: unit test for fs_traversal.h

This adds a test case for the FileSystemTraversal<> engine.