Use skbio's fastq formatters
Change rmdir to rmtree to remove nonempty dirs
Merge pull request #1680 from adamrp/split_fastq_fix

Split fastq fix
resolve issue 1682
self.test_out correction
Fix futures version issue with scikit-bio

See https://github.com/biocore/scikit-bio/issues/691
Merge pull request #1684 from jairideout/futures-version-fix

Fix futures version issue with scikit-bio
Merge pull request #1683 from ekopylova/fix_1682

Fix 1682