Aware

This adds the ability to segment the users on their frequency of visit over the last few days.

- should identify a first-time visitor
- should identify a return visitor
- should calcuate the number of seconds since my last visit
- should identify the frequency of visits "today"
- should count frequency of visits to different sections over the last few days
Moved storage to a single key containing a JSON model
Remove uneccassary init()'s
Decimal radix
Merge pull request #723 from guardian/aware

Aware