Fix #168, Fix #1506
fixing errors
pulling latests version and fixing small error
add swarm as denovo picker
tests
Typos
Merge pull request #1651 from ekopylova/add-swarm-denovo

Add swarm de novo
Merge pull request #1653 from frederic-mahe/patch-3

Typos
Merge pull request #1513 from antgonza/fix_168_1506

Fix #168, Fix #1506
Addressing comments on parallel/align_seqs.py
Addressing comments on parallel/alpha_diversity.py
Adding docstring
Addressing comments on parallel/assign_taxonomy.py
Adding test for merge_distance_matrix
Refactor merge_distance_matrix
forced abspath on reference fp
Adding test for get_sample_id_groups
updated docstrings, added more tests
flake8 compliant
removed the 'uclust' from --uclust_similarity and --uclust_min_consensus_fraction in the parallel assign taxonomy scripts to correspond with the changes in scripts/assign_taxonomy.py