I've ported go()/visit() from 5.8 to 5.7 now, including the tests.

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`svn info` before creating the patch:
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URL: http://dev.catalystframework.org/repos/Catalyst/Catalyst-Runtime/5.70/trunk
Repository Root: http://dev.catalystframework.org/repos/Catalyst
Repository UUID: 4ad37cd2-5fec-0310-835f-b3785c72a374
Revision: 9055
Node Kind: directory
Schedule: normal
Last Changed Author: jhannah
Last Changed Rev: 9031
Last Changed Date: 2009-01-07 20:51:06 +0100 (Wed, 07 Jan 2009)