Fix: URL Encode keys and values in URL encoded form data #698
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As noted in #687, the existing implementation of our querystring
construction was not valid according to the HTTP/1.1 specification,
which was noticed with an integration issue with Apache Tomcat.
This affects both the generation of Query Strings, and URL encoded form
parameters.
The solution is to ensure that we always URL-encode the keys, as well as
the values.
It appears that the existing test we had for this, "returns a Rails
style query string", was not actually quite testing what we thought it
was, as we had not tested the rendering of the raw values, only the URL
decoded ones.
Closes #697.