Ensure name-less columns can be printed, plus test case and bug-fix note.
str -> six.text_type, move change to 0.3.2 bug-fix section
Merge pull request #2214 from mdboom/misc/dont-write-pyc

Don't generate .pyc files when running tests
Merge pull request #2213 from mhvk/column-no-name-header

Column with no name cannot be printed
Don't fail -P if docs missing