Feature news panels config

## Ready State: (Yes)

This pull request is related to the following JIRA tickets: [LDC-230 Create panelized news article display page](https://imagex.atlassian.net/browse/LDC-230) & [LDC-321 Create the news listing page display news articles](https://imagex.atlassian.net/browse/LDC-231).

## Requirements & Dependencies

### LDC-230
* Every content type that uses panelizer will use the 'full page override' setting. This requires the `page_manager_node_view_disabled` variable to be set to `0`. Because this is is required by multiple modules, we can't store it in this particular feature. This variable should be set during the installkit install process.
* added dependencies on imagex_date and imagex_user

### LDC-231
* added dependences on imagex_page, views and uuid features

## Deployment Instructions

* Merge code.
* Make sure dependencies are in place
* Enable module `imagex_news`: `drush en imagex_news`
* Clear caches with `drush cc all`

## Usage/Test Instructions

### LDC-230
* News panelizer configured. Based on 'full page override'. All news node items are added trough the default panelizer panel, including references to a user image field and custom date format.

### LDC-231
* Added a page node named 'News' with an overridden panelizer panel containing a news listing view pane.

### LDC-232
* Added a 'The Best of Linux News' views pane showing all news items tagged with 'best-of'
* Includes a 'best-of' tag.