ENH: performance enhancement, fixes #411
MAINT: Change test to use context manager
Merge pull request #532 from timvg80/issue-411

ENH: performance enhancement, fixes #411
DOC: Fix annoying comment from @gregcaporaso
Merge pull request #533 from ElDeveloper/minor-fixes

DOC: Minor fixes to a few files
DOC: Fix typo in genetic code docstring

Fixes #536.
Merge pull request #539 from jairideout/issue-536

DOC: Fix typo in genetic code docstring