More improvments

[maxulysse]

• Improve MD linting
• MD linting is now a stage on Travis-CI
• Tests are sorted, timewise
• Use kraken profile for Jenkins testing
• Use YAML anchors to simplify circle CI image building and deployment to DockerHub
• Improve testing script (remove ALL from TEST)
• Use direct link to slack channel
• Usual code polishing
• New genomes.config for genomes without AWS iGenomes
• smallGRCh37 is now in genomes.config

PR checklist

• This comment contains a description of changes (with reason)
• If you've fixed a bug or added code that should be tested, add tests!
• If necessary, also make a PR on the nf-core/sarek branch on the nf-core/test-datasets repo
• Ensure the test suite passes (nextflow run . -profile test,docker).
• Make sure your code lints (nf-core lint .).
• Documentation in docs is updated
• CHANGELOG.md is updated
• README.md is updated

Learn more about contributing: https://github.com/nf-core/sarek/tree/master/.github/CONTRIBUTING.md

[alneberg]

Ok, fine with me. But keep in mind that you need to deal with the linting issues at some point.

[maxulysse]

@apeltzer told me that he'll help me with that.
But I do agree, I need at some point to make linting work, either by changing sarek, or by changing linting...