Adopt Contributor Covenant 1.4

Merge pull request #90 from Sylvain303/master

pull #90 quote every string compare

saving $IFS in run() not altered for code using it

Merge pull request #76 from jwerle/patch-1

Update package.json

Bats 0.4.0

Update copyright year

Merge pull request #68 from duggan/test-summaries

Add skipped count tests in the summary

Print the outermost, not innermost, failed command

Print filenames relative to the working directory

Print the failing status code, if it's significant

`bats_frame_filename` normalizes test filenames

Split print_failed_command from print_stack_trace