[Brightbox] Add support for Cloud SQL service

This adds support for Brightbox's Cloud SQL DBaaS.

It is currently still part of the Compute service so all resources can
be managed from one connection to the service.
Update Flavours.rb with new M3 Instance Types

*Accouncement*: http://aws.typepad.com/aws/2014/01/aws-update-new-m3-features-reduced-ebs-prices-reduced-s3-prices.html
*Instance Types*: http://aws.amazon.com/ec2/instance-types/
Merge pull request #2618 from gaurish/patch-1

Update AWS flavors with new M3 Instance Types
Merge pull request #2620 from brightbox/cloud_sql

[Brightbox] Add support for Cloud SQL service