Add support for ClojureCollector / EC2

Here is a PR for **discussion**. 

I added support for modelling ClojureCollector/EC2. 

I had to make some assumptions about the type of instance / how many events it could handle. I assumed a M3Medium instance could process 10 million events. Of course it's maximal throughput which is the real problem - like Glastonbury or Apple live events.

However it is still not quite right, the S3 cost still use the number of edge locations, but for the Clojure collector there are no edge locations, right?

Also I updated the S3 storage cost as mentioned in #1.