LDC-495: Added admin page, bundle opt-in for inappropriate content flag.

## Ready State: Yes

Added functionality to allow specific bundles to opt-in to the usage of Inappropriate Content flags.

## Requirements & Dependencies

* Requires contrib modules Features, Rules, Views and Flag.

## Deployment Instructions

* Merge code.
* Clear caches with `drush cache-clear all`

## Usage/Test Instructions

* Browse to admin/config/content/inappropriate-content