Fix #576 -- The cache hash function now hashes the parameters for the requested method, and doesn't assume GET requests.
Adding tests for the graphite.render.hashing.hashRequest function.
Removing stripControlChars function, as it's no longer needed.
prune trailing whitespace
Merge pull request #765 from esc/caching-request-hashfix

Caching request hashfix
Merge pull request #24 from graphite-project/master

Pull in Upstream Changes