Activity items identity themselves as `Image`

![screen shot 2014-08-19 at 16 48 09](https://cloud.githubusercontent.com/assets/109850/3968586/4c4af5ee-27b8-11e4-9fe4-4b8a5fcdf06b.png)

Rather than doing this here, I'd like to fall back to an approach like this one:

```
{if displayOptions.metadata || displayOptions.metadata === false}
    {var metadata = displayOptions.metadata}
{else}
        {if resourceType === 'user'}
            {var metadata = tenant.displayName}
        {elseif resourceType== 'group'}
            {var metadata =  '__MSG__GROUP__'|eat}
        {elseif resourceType === 'content'}
            {var metadata = oae.api.content.getMimeTypeDescription(entityData)}
        {elseif resourceType === 'discussion'}
            {var metadata =  '__MSG__DISCUSSION__'}
        {/if}
{/if}
```

and not modify the original object