Update README.md to include Windows exec hint

Added some additional command line info for Windows users to get the exec command working.
Upgrading AWS SDK to version 1.24.0
adding aws sdk logging
improved debug messages
adding cloudwatch_delay for adjusting metric time window
adding tag filtering for ec2 and ebs agents
fixing ec2 detailed monitoring
updating changelog
adding new metrics to elb
removing reference to overview dashboards
adding enabled flag to agent configuration
updated amazon word usage
updating release date in changelog
adding chef/puppet instructions to readme
Ability to run newrelic_aws as a daemon.
Tweak for daemons; needs proper working directory
turning on DynamoDB