strip trailing whitespace

my editor does this by default
Fix link to tox
Fix trailing whitespace

Sorry, my editor does this automatically
Adds HawkREST to 3rd party auth docs
Merge pull request #1447 from kumar303/hawk

Adds HawkREST to 3rd party docs
Merge pull request #1448 from zhanghongfei/master

In the method permission_denied, did not use the request parameter.