* CloudWatch: Datasource improvements
* Add statistic as template variale
* Add wildcard to list of values
* Template variable intercept dimension key
* Return row specific errors when transformation error occured
* Add meta feedback
* Make it possible to retrieve values without known metrics
* Add curated dashboard for EC2
* Fix broken tests
* Use correct dashboard name
* Display alert in case multi template var is being used for some certain props in the cloudwatch query
* Minor fixes after feedback
* Update dashboard json
* Update snapshot test
* Make sure region default is intercepted in cloudwatch link
* Update dashboards
* Include ec2 dashboard in ds
* Do not include ec2 dashboard in beta1
* Display actual region
* fix label handling
* SEARCH() results could have multiple namespace, remove from legend
* divide GetMetricStatistics related code
* divide GetMetricData related code
* divide parseGetMetricDataResponse()
* divide parseGetMetricDataQuery()
* divide test code
* add test for GetMetricData
* add test for GetMetricData parse response
* fix bug of terminating gap
* fix gofmt
