Add Cloudwatch output

closes #553

plugins/outputs/cloudwatch/README.md

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+## Amazon CloudWatch Output for Telegraf
+
+This plugin will send points to Amazon CloudWatch.
+
+## Amazon Authentication
+
+This plugin uses a credential chain for Authentication with the CloudWatch
+API endpoint. In the following order the plugin will attempt to authenticate.
+1. [IAMS Role](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html)
+2. [Environment Variables](https://github.com/aws/aws-sdk-go/wiki/configuring-sdk)
+3. [Shared Credentials](https://github.com/aws/aws-sdk-go/wiki/configuring-sdk)
+
+## Config
+
+For this output plugin to function correctly the following variables
+must be configured.
+
+* region
+* namespace
+
+### region
+
+The region is the Amazon region that you wish to connect to.
+Examples include but are not limited to:
+* us-west-1
+* us-west-2
+* us-east-1
+* ap-southeast-1
+* ap-southeast-2
+
+### namespace
+
+The namespace used for AWS CloudWatch metrics.