wrong input argument
fixing logic bug for filter_missing
adding tests for directories()
local_dir should not be prefiltered, reforming logic in directories() to mirror files()
fixing tests to account for removal of pre-filtered paths
adding DEFAULT_ prefix to classvars
adding DEFAULT_ prefix to classvars
adding additional instance tests, added test_files_unfiltered()
added remaining tests for file filtering
don't let load error break parsing of other files
don't populate os.environ by default..
adding tests for load()
adding no cover for areas we're already convering, platform dependent code, and logging statements
removing outdated docstring