[MRG] add query name to CSV output of sbt categorize

[ctb]

Adds another column to the csv output for sourmash categorize for the query name. Fixes #132.

• 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 #421 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #421   +/-   ##
=======================================
  Coverage   90.07%   90.07%           
=======================================
  Files          32       32           
  Lines        4824     4824           
  Branches       36       36           
=======================================
  Hits         4345     4345           
  Misses        478      478           
  Partials        1        1

Impacted Files	Coverage Δ
sourmash_lib/commands.py	90.85% <100%> (ø)	⬆️

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[ctb]

ready for review!

[standage]

Looks straightforward enough to me!