LdC-324: Create Aggregator

## Ready State: Review

This pull request is related to the following JIRA tickets:

https://imagex.atlassian.net/browse/LDC-324

## Requirements & Dependencies
* Aggregator
* Entity API

## Deployment Instructions

* Merge code.
* Enable Module

## Usage/Test Instructions
* Go to admin/config/services/aggregator
* Add Feed
* Set Feed Title, URL, Entity, Bundle
* Set Filters and Mapping
* Save Feed
* On admin/config/services/aggregator Click 'update items'
* Feed should be grabbed and the items imported into the entity types you chose