Record and display package "usage" information

[rgrp]

• Number of package page visits on ckan (can we get this straight from google analytics)
• Number of times url or download url is used

How do we do this?

• Google analytics will miss a lot of this usage (and how do we get that data out anyway)
• Could use javascript but again misses usage.
• One option is to redirect link but that is kind of nasty (but may be only option ...)