Feature: LDC-248: Initial commit of contest content types & permissions

## Ready State: Yes

This pull request is related to the following JIRA tickets:
https://imagex.atlassian.net/browse/LDC-248
https://imagex.atlassian.net/browse/LDC-45

Basic contest content type build out.

## Requirements & Dependencies

* Requires: entityreference, entityreference_prepopulate & inline_entity_form

## Deployment Instructions

* Merge code.
* Enable imagex_contest & imagex_contest_permissions features
* Clear caches with `drush cache-clear all`

## Usage/Test Instructions

* Ensure the contest & contest entry content types exist
* Ensure all fields listed https://imagex.atlassian.net/browse/LDC-248 are present
* Create a contest node
* Ensure you see a "Submit Your Entry Now" link to the bottom of the contest node, clicking the link allows you can create a contest entry node with the "Related Contest" field prepopulated