[elb] [spec] mock => double
[elb] [spec] Less noisy setup

Additionally, health is checked for unexpected key access.
[elb] Separated data collection from statistic computation

And even less loc
[elb] [spec] Refactored to subject
[elb] Report number of ((un)healthy) zones
[elb] Renamed build_statistics
[elb] Renamed az to zone
Merge pull request #5 from phorsuedzie/elb-zones

Elb zones