added failing test for behavior that @jrrideout caught
code clean-up: made _get_consensus_assignment a lot cleaner
changed formatting string
code clean-up
code clean-up
code clean-up
code clean-up
doc clean-up
code and doc clean-ups
bug fix - noticed bc i copied scripts/parallel_assign_taxonomy_rdp.py to create scripts/parallel_assign_taxonomy_uclust.py, and @jrrideout noticed the issue in the latter
added test of ParallelUclustConsensusTaxonomyAssigner
code clean-up