Link to the actual exception references

Sphinx has a neat cross-referencing feature where if you include the tilde
character in front of a :py: class, it'll link to the full object but provide
only the last part of class name in the text. For more info see
http://sphinx-doc.org/domains.html#cross-referencing-syntax
Add self to AUTHORS
Merge pull request #1419 from kevinburke/exception-links

Exception links