Allow relative redirects beginning with /

URIs from REDIRECT headers which begin with a forward slash now redirect
relative to the BASE_URI.
Remove about/media and about/publicdocs

Both were empty, and have also been removed from the home page menu.

Change-Id: Icce15853c16a1b24c680f673c2014731e483d26b
Update SR2013 risk assessment to 6401c150

Change-Id: Iac91c8e210c177ee9f598864dd603a148e076eba
Point risk assessment link to SR2013's pdf.

Change-Id: Id11881f70ed7ab329f70799a0ffd1db8f3dfbd98
Merge "Update SR2013 risk assessment to 6401c150"
Merge "Point risk assessment link to SR2013's pdf."
Add a competition 2013 news piece

Give a brief history of the teams' journey so far and link to some
of the more interesting teams' robot videos showing promise.

Change-Id: I62f1473ef936c2a3ad2eb29316c45191fe6ac431
Merge changes Icce15853,Ie7dd4e72

* changes:
  Remove about/media and about/publicdocs
  Allow relative redirects beginning with /
Merge "Add a competition 2013 news piece"