Expand protocol tests for RestJson1.1 and AwsRestJson (#38)

* Add document types & other bug fixes to support AwsJson11

* Expand protocol tests for RestJson1.1 and AwsRestJson

This diff adds RestJson1 and AwsJson1.1 to the integration test suite. It uncovered a number of bugs, some of which I fixed inline and some I filed issues for and disabled the tests.

* Add another disabled test & cleaup

* Fix tests broken by changing URL encoding to encode ':'

* Copy-paste Aarons comment

* Fixup Rustfmt