Add AWS SDK gem
Add Cloudwatch namespace, remove freeze
Add cloudwatch datapoint library
Update metric factory for Cloudwatch. Randomise data
Remove unused metric and services helpers
Genericise the datapoint retrieval from a Metric. Add helper function and tests
Add tests for the service model's latest three metrics function
Merge pull request #20 from intercom/df/cloudwatch-datapoints-lib

Add basic Cloudwatch support. Improve all metric and service tests
Update gems