Build info improvements

Add a few nice touches to the build info provided on the deployment page.
Namely:
 - search for success/failure strings and colour the tag appropriately
 - make tag a hyperlink if it ends with a valid https? link
Have a consistent convention for the end of the tag would be OK (change contains to endsWith). I'm not so convinced about mandating the whole of the tag text - people may well have different use cases and want to be able to have multiple tags.