0.4.0

extend aws (#47)

dev

• add logger to both the S3 and GCS classes.

GCS

• add rename method to the Bucket class.

AWS

• the S3 class initialization does not take the aws credentials as arguments, but read them from environment variables.
• add get_bucket method to the S3 class to return a more comperhensive Bucket object.
• add Bucket class that represents an S3 bucket.
• the Bucket class has methods for uploading, downloading, and deleting, renaming and listing files.