:white_check_mark: Add tests for --bare and --no-versions
:white_check_mark: Add tests for --bare and --no-versions

Previously there were only tests for the default print format (the one
invoked by calling `apm list`). This commit adds tests for the default
print format with `--no-versions`, and for both `--bare` and
`--bare --no-versions`.

atom/apm,atom/apm,atom/apm,atom/apm