disabled the pre-filter by default
updated default parameters for uclust-based OTU pickers. fixes #1585
fixed error
fixed bug in test
added link to peerj preprint
fixed formatting
fixed typo
fixed merge conflicts
BUG: Remove failing_tests.sh

That file is not needed in the repository.

Fixes #1592
Merge pull request #1594 from ElDeveloper/failing-tests

Remove tests/failing_tests.sh
fixed typo
updated tutorial to reflect publication of PeerJ PrePrint, and to generally bring up-to-date
updated description of reference
updated discussion of parameters file
removed description of fast uclust parameters
fixed over-indentation
fixed soem typos
Merge pull request #1586 from gregcaporaso/issue-1585

updates to OTU picking parameter defaults