Allow cross account S3 access #21
Description
Add roles and templates to allow access to data hosted in a different account.
Something like the method described here should work : http://docs.aws.amazon.com/AmazonS3/latest/dev/example-walkthroughs-managing-access-example2.html
Another point of concern is that the data should always be in N.Virginia or whichever region is chosen as the default base of operations.
Use case: Account A holds sensitive datasets in BucketA. Account A wants to compute on Kotta hosted by Account B, however does not want copies of original data to move to buckets of B. (A=dsapp, B=klab)