Httplib2

IronPython2.7: relative import iri2uri fixes ImportError
https://github.com/httplib2/httplib2/pull/163

python3 + debug + IPv6 disabled: https raised
"IndexError: Replacement index 1 out of range for positional args tuple"
https://github.com/httplib2/httplib2/issues/161

python3: no_proxy was not checked with https
https://github.com/httplib2/httplib2/issues/160

feature: Http().redirect_codes set, works after follow(_all)_redirects check
This allows one line workaround for old gcloud library that uses 308
response without redirect semantics.
https://github.com/httplib2/httplib2/issues/156

IMPORTANT cache invalidation change, fix 307 keep method, add 308 Redirects
https://github.com/httplib2/httplib2/issues/151

proxy: username/password as str compatible with pysocks
https://github.com/httplib2/httplib2/issues/154

python2: regression in connect() error handling
https://github.com/httplib2/httplib2/pull/150

add support for password protected certificate files
https://github.com/httplib2/httplib2/pull/143

feature: Http.close() to clean persistent connections and sensitive data
https://github.com/httplib2/httplib2/pull/149