Use full request to check for canonical URI.

[farbeiza]

I needed to make this change to maintain the query string when redirecting to the canonical. Furthermore, I think it gves more flexibility; it would allow you to change the host for the redirect, for instance._

[atomist[bot]]

Commit messages of this repository should follow the seven rules of a great Git commit message, as mentioned in the project's contributing guidelines. It looks like there's a few issues with the commit messages in this pull request:

• The first line of the commit message is the subject, and should not end with a period.