Extend live stats to log ab-test page views and sessions
Count page views and sessions for each ab test variant
Push views per session ab data to cloudwatch
Add diagnostics server to load balancer metrics
Add admin agent to fetch ab test names and variants
Add line charts to ab admin page
Add ChartTable class to process cloudwatch datapoints into google charts
Add multiline colours to ab test charts
Merge branch 'master' into cloudwatch-ab-analytics

Conflicts:
	dev-build/conf/routes
Merge pull request #2724 from guardian/cloudwatch-ab-analytics

Cloudwatch ab analytics