Document API change in hist
Merge pull request #2430 from neggert/hist_doc

Document API change in hist
Updated coding standards test to raise an exception containing the PEP8 failiures.
Merge pull request #2436 from mdboom/locale-explicit-exception

Catch explicit exceptions when setting locale.
Fixed failing PEP8 tests.
Merge pull request #2099 from pelson/re-enable_pep8_test

Updated coding standards test to raise an exception containing the PEP8 failiures.