Url encode query string for pure query
Anonymous sts connection does not search for creds
Add docstring for sts anon
Merge pull request #2720 from kyleknap/sts-anonymous

Url encode query string for pure query
Handle sigv4 non-string header values properly
Add a unit test
Merge pull request #2744 from kyleknap/int-headers

Handle sigv4 non-string header values properly
Merge branch 'develop' of https://github.com/boto/boto into storage_class