Add improved documentation for `pecan.request` and `pecan.response`.

Change-Id: I6f27e5a352000758b959f70d19261389a3ea97b7
Closes-Bug: 1276869
Fix a trailing slash bug for `RestController`s that have a `_lookup` method.

Change-Id: Ibefa6742d0411b8cb8ae1592c8b1ca077088c5e6
Merge "Add improved documentation for `pecan.request` and `pecan.response`."
Merge "Fix a trailing slash bug for `RestController`s that have a `_lookup` method."
Version increment.

Change-Id: Ic3333885875af332f751dc46cfa7ef67d03f20c5