Updated alias_template to be W3C compliant (and added backup message to template)

Fixed two non-compliance errors with alias_template:
"Bad value 0;url=#{destination_path} for attribute content on element meta: Expected a space character, but saw u instead."
"Element head is missing a required instance of child element title."

Added body to alias_template, in case the user has automatic redirects disabled. It provides a link to the destination.

Fixed source repository url link (it was 404ing)