Fix FutureWarning in qiime.stats._perform_pairwise_tests
MAINT: update compare_categories.py to use latest skbio anosim and permanova API
MAINT: update compare_distance_matrices.py to use scikit-bio's mantel function with --method mantel
MAINT: update compare_categories.py --method mantel_corr to use scikit-bio's mantel function
update correlogram plotting to only plot p-vals that aren't None/NaN
remove old mantel code in favor of scikit-bio's mantel function
update docstring for mc_t_two_sample
DOC: Fix group_significance.py Sphinx issues

Fixes #1467 #1615.
DOC: fix remaining Sphinx errors in doc build
MAINT: remvoing tests for supported versions for python packages. these are outdated, incomplete, and redundant (as the versions are already reported here)
ENH: version information for sumaclust and sortmerna now included, fixes #1735
BUG: split_libraries_fastq.py --phred_offset no longer ignored

Fixes #1656.
BUG/DOC: fixed bug, and cleaned up some docs while I'm at it
Remove lanemask requirement from qiime config, store lanemask in qiime.filter

Related to #1696.
Merge pull request #1761 from gregcaporaso/issue-1735

updates to print_qiime_config.py
Remove qiime.quality imports

:woops:
Remove lane mask from test_ampliconnoise.py
DOC: fix capitalization
DOC: add ARB reference to qiime.filter.get_lane_mask

Based on Phil Hugenholtz's suggestion by email.
Merge pull request #1763 from jairideout/bug-fix-party

Bug fix party!