Add logging/stats capability

[Chris Drew]

Put in some functionality to record stats when someone visits the site.

The middleware here might be helpful - http://code.google.com/p/diamanda/source

[Chris Moffitt]

Ooops. Added in [293]

[Chris Moffitt]

Added google analytics support in [292]

[Chris Moffitt]

Upon further reflection, my inclination is to add some minor template tweaks to support google analytics. I think it's outside the scope to fully integrate my own analytics software. Google does it much better than we could!