Temporary branch for a metagenome workshop at UCSC

[ctb]

See 2017-ucsc-metagenome.rtfd.io

Contains #183 and #175. Will not merged, although those branches might be :).

• Is it mergeable?
• make test Did it pass the tests?
• make coverage Is the new code covered?
• Did it change the command-line interface? Only additions are allowed
  without a major version increment. Changing file formats also requires a
  major version number increment.
• Was a spellchecker run on the source code and documentation after
  changes were made?

[codecov-io]

Codecov Report

Merging #188 into master will decrease coverage by 0.56%.
The diff coverage is 64.19%.

@@            Coverage Diff             @@
##           master     #188      +/-   ##
==========================================
- Coverage   85.42%   84.85%   -0.57%     
==========================================
  Files          13       13              
  Lines        1894     1922      +28     
  Branches       52       52              
==========================================
+ Hits         1618     1631      +13     
- Misses        265      280      +15     
  Partials       11       11

Impacted Files	Coverage Δ
sourmash_lib/signature.py	86.13% <36.36%> (-2.99%)	⬇️
sourmash_lib/sbtmh.py	82.22% <36.84%> (-12.52%)	⬇️
sourmash_lib/commands.py	90.13% <80.39%> (+0.69%)	⬆️

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[ctb]

Closing (but not deleting).