Added nitpick options (still False by default)
Fix some API links and added some exceptions
Move nitpick exceptions to a separate file
Fixed more API links
Re-enabled intersphinx on Travis
Make smart reference resolver aware of private classes and methods and
not warn about those.
Add list links as exceptions as they depend on the python docs and thus won't be solved any time soon
Fix more links
Add more python3 exceptions
Fixed more API links. Fixes #2510.
Adding python3 links
Fixing a few more api links
Moving python3 intersphinx file to astropy-helpers
Fixed the last few API links
Remove ‘object’ from exceptions since it is already included in the Python 3 intersphinx file
Small improvements to exceptions file
Updated astropy-helpers to latest version to include Python 3 intersphinx file
Merge in latest changes from astropy-helpers, which removes the need for the astropy.config workarounds
Fix one more last link
Fix failing tests on Travis