Adding a Filter to the Feature Content. Related #16

I'm adding a filter to the feature content. A user can use this plugin to modify the feature content before it is sent to the screen.

In my specific use can I want the ability to process shortcodes in the feature content - see [issue #16](https://github.com/woothemes/features/issues/16)

To take advantage of the filter this is all you would have to do:

``` php
function my_features_content_filter( $content ) {
	// do stuff to the content here
	return $content;
}
add_filter( 'woothemes_features_content', 'my_features_content_filter', 20 );