Misc: LDC-256 - misc enhancements to contest functionality related to th...

## Ready State: Yes

Relates loosely to jira task: https://imagex.atlassian.net/browse/LDC-256

Whole load of enhancements:
* Better entity_metadata_wrapper property checking
* Added HTML classes to views & panels displays
* Added panelizer layout for contest entry nodes
* Altered panelizer layout for contest nodes
* Removed imagex_contest_voting feeatures override as not apply correctly, voting data in view is bundled into same view

## Requirements & Dependencies

None

## Deployment Instructions

* Merge code.
* Enable module `imagex_contest`, `imagex_contest_permissions` & `imagex_contest_voting`
* Clear caches with `drush cache-clear all`

## Usage/Test Instructions


### As an admin

* Ensure you can create contest nodes
* Ensure you can view the "Contest Overview" tab on contest nodes & select entries as finalists or winners in bulk if any entries have been submitted

### As Auth User

* View a contest node and ensure you can submit entries (if its open) and vote on entries (if voting open)
* Ensure you see the "Vote Node" tab on contest nodes if voting is open