Calculate new AWS cost estimates

[ferjm]

Calculate new AWS cost estimates with these resources:

• 3x m3.medium ec2 servers to run SensorWebAPI, SensorThings API and Notifications Manager
  • this is a cluster so each server will run SensorWeb, SensorThings and a Notifications Manager
• 1x t2.medium for Sensors Heartbeat Monitor
• 1x t2.medium for admin console
• 1x db.r3.large (multi-az) for the database server
• 2x AWS ElasticLoadBalancers (for SensorThings and SensorWebAPI endpoints)

[ferjm]

Actually, let's try to have #26 closed before this one.