Updated read me to point at correct pre-release version.
Updated readme to point to correct pre-release version.
Pull AWS credentials from ENV if available

Use AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables
for AWS credentials if they are not present in the ec2.yml config.
Exit 1 when encountering rolling deployment errors, after displaying the rolling deployment status overview.
Update changelog and readme for v1.4.3.pre7.
Clarify example servers in the 'Options -> Via EC2 Tags' section.
More clarification of server options defined in EC2 and when calling 'ec2_role' or 'ec2_roles'.
Merge branch 'rolling_deploy'

Conflicts:
	readme.md, just replaced with the new one from rolling_deploy.
Update version and changelog for v1.4.3 release.
Fixed bug with rolling deploys where server-specific options were not always applied
Merge pull request #28 from forward/options_bug

Fixed bug with rolling deploys where server-specific options were not al...
Fix some issues with customised 'Roles' tag not being respected. Made the 'Options' tag configurable too. Use the customised 'Roles' and 'Options' as headers in the 'ec2:status' command.
Readme and Changelog updated for v1.4.4.
Fixed an issue where instances would be removed from their ELB during rolling deployment, even if --dry-run was set.
Update changelog for v1.4.5, fixes #27.
Fix documentation issue relating to task restriction via roles and options.
Merge branch 'pull_config_from_env' of github.com:fixlr/capify-ec2 into fixlr-pull_config_from_env

Conflicts:
	lib/capify-ec2.rb
Fix an issue with the previous merge, my bad!
Update Readme and Changelog for v1.4.6.
Look for AWS credentials in the 'ec2.yml', then in the Fog configuration, and finally as environment variables.