Added S3 specific attributes

* ['hadoop']['dfs']['uri] specifies DFS type being used - s3, hdfs etc.
* ['hadoop']['s3']['bucket'] specifies name of the s3 bucket.
* Updated README accordingly

Signed-off-by: Shashank Sahni <shredder12@gmail.com>
Included all sub-recipes in default.rb

To make default as a generic recipe and default endpoint, all recipes are
conditionally included in it.

Operators can still do custom deployments using separate recipes.

Signed-off-by: Shashank Sahni <shredder12@gmail.com>