Clarify differentiate() coordinate values.
Add skip_data for tests that require it.
Merge pull request #1263 from QuLogic/tests-skip_data

Add skip_data for tests that require it.
Make tests compatible with Pillow.

Pillow returns Unicode strings instead of str objects, so the tests
fail since there's an extra u prefix in the repr.
Fix pp_rules._all_other_rules for pep8.
Merge pull request #1253 from rhattersley/differentiate-docs

Clarify differentiate() coordinate values.
Merge pull request #1267 from QuLogic/pillow-compat

Make tests compatible with Pillow.
fixed tolerance bug in intersection
fix so that circular logic can handle scalars
review actions
review actions
Merge pull request #1269 from pp-mo/pep8_pp_rules

Fix pp_rules._all_other_rules for pep8.
Explicitly set version of gribapi
BUG: Fixed varname setting in aux con.
Merge pull request #1283 from cpelley/corrected_netcdf_varname

BUG: Fixed varname setting in aux con.
Merge pull request #1282 from dkillick/explicit_gribapi_ver

Explicitly set version of gribapi in .travis.yml
Explicitly set ecmwf_grib version in .travis.yml
Merge pull request #1285 from dkillick/explicit_gribapi_ver

Explicitly set ecmwf_grib version in .travis.yml
Merge pull request #1271 from esc24/intersectionbug17

Fixed tolerance bug in intersection
Merge pull request #1272 from esc24/circular_scalar

Fix so that circular logic can handle scalars