Label change

# Ready State: YES

This pull request is related to the following JIRA tickets: https://imagex.atlassian.net/browse/LDC-161

Module to rename label for Promote to Front Page - to Featured
Renamed extension module imagex_featured_content to imagex_content_featured (as it should have been)
Added README to this and page extension module

## Requirements & Dependencies

*  views
* features

## Deployment Instructions

* Merge code.


## Usage/Test Instructions

* Ensure, on node edit Promote to Home Page is re-labeled 'Featured'
*
* Visually view the changes on the homepage.