FYI @nathanielmanistaatgoogle @jonparrott @waprin I am going to factor out all of the usage of httplib2 into a standalone module so we can have a clean break when the time comes to use a better maintained library.

I plan to start soon to please weigh in ASAP with any comments or concerns or requests for API surface area.

Also see #128 for a more "detailed" (but old) plan.