Feature: LDC-250 & LDC-266 - finalist & winners notifications

## Ready State: Yes

This pull request is related to the following JIRA tickets: 
https://imagex.atlassian.net/browse/LDC-250
https://imagex.atlassian.net/browse/LDC-266 (in progress)

## Requirements & Dependencies

None

## Deployment Instructions

* Merge code.
* Enable imagex_contest & imagex_contest_permissions & imagex_contest_addthis
* Clear caches with `drush cache-clear all`

## Usage/Test Instructions


### LDC-250

* Ensure the email address of the user you're logged in as matches your own 
* Create a contest node and then add at least 1 contest entry for that contest.
* For the given contest, click the "Contest Overview" tab and use bulk operations to trigger the "Select As Finalist" & "Select As Winner" operations. Ensure:
  * Step 1 displays the option to notify or not notify the entry author via email
  * Yes option is default
  * Selecting yes, you receive an email
  * Selecting no, you do not receive an email

### LDC-266

* Create a new contest entry node for the same contest created above
* When viewing the contest entry node which is not selected as a winner or finalist ensure you see "Select Entry As Finalist" & "Select Entry As Winner" links 
* Clicking either link loads a confirmation page similar to the Views Bulk Operations form in LDC-250
* Follow the "Select Entry As Finalist" workflow should do the following:
  * set the contest entry status to "Finalist" (only done if not already a finalist)
  * send an email to the contest entry author if opted in during workflow (only done if not already a finalist)
* Follow the "Select Entry As Winner" workflow should do the following:
  * set the contest entry status to "Finalist" & "Winner" (only done if not already a winner)
  * send an email to the contest entry author if opted in during workflow (only done if not already a winner) 

#### Finalist Email Example

```
Subject: Congratulations, your contest entry was selected as a finalist.
Content: Congratulations, your contest entry on the contest, Linux Logo Design Contest
(http://imagex.linux/?q=content/linux-logo-design-contest) was selected as a
finalist.

Your entry: Test entry (http://imagex.linux/?q=content/test-entry)
```

#### Winner Email Example

```
Subject: Congratulations, your contest entry was selected as a winner.
Content: Congratulations, your contest entry on the contest, Linux Logo Design Contest
(http://imagex.linux/?q=content/linux-logo-design-contest) was selected as a
winner.

Your entry: Test entry (http://imagex.linux/?q=content/test-entry)
```