Corrected network throughput of m2.2xlarge

According to http://aws.amazon.com/ec2/instance-types/#measuring-performance, m2.2xlarge the network throughput for m2.2xlarge is  Moderate. It also has EBS-Optimized available at 500 Mbps [http://aws.typepad.com/aws/2013/03/additional-ebs-optimized-instance-types-for-amazon-ec2.html].
Merge pull request #41 from Bilzac/master

Corrected network throughput of m2.2xlarge