+ added libs for S3 and dynamoDB (NOTE: you need to have AwsCredentials.properties in your src folder for the services to work)
+ add a PrepareDataBase class that creates an img database in DynamoDB and creates an img bucket in S3 and then, stores two image files in S3 as well as their corresponding info in DynamoDB
+ adds a computeThumbnail capability to the ImageBean class
- TODO: add a cleanup function to the PrepareDatabase class
- TODO: change the GET/PUT/POST/DELETE functions to interact with S3 and DynamoDB instead of local storage
- TODO: use Amazon Simple Workflow Service to run the computeThumbnail in the background