Fix a problem to redirect wikipage named by multi-byte characters

In some specific case, redirect path (created from route params) is incorrect.
`redirectUrl` is expected to be encoded,
but scalatra decodes route params by rl.UrlCodingUtils via ScalatraBase.UriDecoder.
To avoid this problem, I add dirty workaround to encode redirect path.
Merge pull request #164 from smly/feature/bugfix-redirect-encode

Fix a problem to redirect wikipage named by multi-byte characters