Feature: Updated README

Updated README from Dhruv Bansal

Squashed commit of the following:

commit a25383bbb6d1cf800f5d65a803c2e69ada6496b7
Author: Dhruv Bansal <dhruv@ph.utexas.edu>
Date:   Fri Mar 21 14:27:09 2014 -0500

    updated README with more context for reading from ElasticSearch

commit e24104f608be78bdf5f4e0241141747b83537af6
Author: Dhruv Bansal <dhruv@ph.utexas.edu>
Date:   Fri Mar 21 10:56:13 2014 -0500

    updated README to be more accurate based on all the work we've done recently

Change-Id: Iba3017bf9f3476409bb3ee71f5a52ff543e16e27