Refactor Signer class#127

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robkinyon wants to merge 6 commits intojoestump:masterfrom

robkinyon:master

Commits on Jan 25, 2013

Remove usage of httplib2 constant in signature of Client.request()
Rob Kinyon
committed
Broke out the signer code from the client code so that it can be reused more easily
Rob Kinyon
committed
Minor cleanup
Rob Kinyon
committed

Commits on Jan 26, 2013

Refactored the Signer class out of the Client class so that it can be reused in Twisted and/or Tornado.
robkinyon
committed

Commits on Jan 28, 2013