Remove failure message from the PR linker

This will get rid of that noise that I created.

Instead of this, maybe we should fetch a list of all repos in our org,
and only look for text that matches them.
Remove description of PR

Github added HTML fanciness that makes HipChat pull in this info when we
just post the link.
Merge pull request #13 from PipelineDeals/remove-failure-message

Remove failure message from the PR linker