This is a plugin which provides an interface to retrive files from amazon-s3
which are archived in to s3.

Users need to give the above information for cloudsync to retrieve the file
from s3.

TODO:
1- A separate commit in to developer-guide will detail about the usage
of this plugin in more detail.
2- Need to create target file in aws-bucket with "gfid" names. Helps avoiding
name collisions.

Change-Id: I2e4a586f4e3f86164de9178e37673a07f317e7d9
Updates: #387
Signed-off-by: Susant Palai <spalai@redhat.com>