Add py3.4 to .travis.yml
Add some missing documentation
Remove WebDAV from HTTP exceptions
Update news.txt
Removed link, replaced it with class link
Add exceptions documentation

This adds the exceptions as documentation for WebOb so that it can be
referenced in index.txt
Update HTTP Exception documentation
Use autoexception instead of autoclass
Merge pull request #173 from bertjwregeer/fix.documentation

Update the documentation for WebOb.exc
Merge branch 'travis-py34' of dairiki/webob into dairiki-travis-py34
also enable pypy3
require 100% coverage and use tox for travis