Added basic caching infrastructure as well as domain page count caching
page count and domain count
Cache count refactored
Improving DomainDetailsHandler
Docs started
Docs
including docs
Using reference data for violations from HTTPArchive
Domains Details: Optimizing get_active_reviews

Created violations_count and last_review_uuid column
in the Pages model
TestCache: Fixed get_active_review_count

Replaced 'get_review_count' with 'get_active_review_count'
Tests passing
Releasing 0.4.9