Update CircleCI and add testing for OSX

[Ulthran]

• [ ] I have run bash tests/test.sh on a local deployment and the tests passed successfully
• [ ] If this adds a new output file, I have added a check to tests/targets.txt
• [ ] If this fixes a bug, I have added an appropriate test to tests/test.sh
• [ ] If this adds or modifies a rule that uses FASTQ files, the input accepts gzipped FASTQ and outputs gzipped FASTQ, or marks uncompressed FASTQ output as temp