Article URL update

Optimised code for acquiring model name

Updated link to tutorial

Renamed rake task file

Dynamic ES type name

Fixed typo

Improved autosuggest_aggregate method to accept custom fields

Fixed controller location and replaced query condition

Added an `es:reload` rake task

Fixed typo in README

Added License note

Search results backwards compatible with ActiveRecord:Relation

Implemented search controller

Added Elastic Search support to model

Refactored Gemfile