Bump EC2 api version to latest to support network interfaces and associating public IPs
Specify IamInstanceProfile as a type on run instances options
Add placement tenancy on RunInstances
Allow EbsOptimized option to be set when running instances
Merge pull request #123 from hailocab/additionalfields

Additional RunInstances options and change to IAM Instance Profiles
Fix elb DescribeInstanceHealth not working with multiple instances
Merge pull request #124 from serialx/master

Fix elb DescribeInstanceHealth not working with multiple instances
Fix gofmt in elb.go
Merge pull request #125 from serialx/master

Fix gofmt in elb.go
Merge remote-tracking branch 'crowdmob/master'

Conflicts:
	ec2/ec2.go
	ec2/ec2_test.go