Simplified imports.
Added new instance types.
Shortened imports.
Fixed #39.
scalariform applied
Split out awaitInstances into separate method.  Added instances method
that takes a list of instance ids.
Made polling interval a method argument to awaitInstances.
Need to continue to pass check interval through recursive calls.
Added awscala.emr.Cluster object and methods on the object: name, state,
bootstrapActions, steps, terminate. Fixed EMR.terminateCluster
Formatting.
Interface change for EMR package.  Need to bump version.
Pass region implicitly.
Added runningClusters and recentClusters.
Eliminated new Cluster class.  Use existing aws.model.Cluster class.
Added wrapping Cluster object.
Add status method on new cluster object that returns the latest status.
Added Scala versions of getters.
Refactor awscala.emr.Cluster
Bump AWS SDK 1.7 to 1.8, joda-time 2.3 to 2.4

 - Fix awscala.s3.PutObjectResult API deprecation
Bump dependencies