Update homepage references from Housetrip to Paul Tsochantaris

The homepage at `http://ptsochantaris.github.io/trailer/` refers in various places to `Housetrip` and `http://dev.housetrip.com/trailer/`which no longer exists, and, most importantly, has a broken download link. This PR updates the various links and text to replace those references, and fix the link.

Some things I've left alone as I'm not sure what to replace them with. Therefore I've commented out the `Brought to you by` section, and just left the Google Analytics section as is.