[Feature] Add Phone Icon to Recognized Social Media Icon Links

[jessecowens]

Is your feature request related to a problem? Please describe.
Users would like to add a "Call" Icon to the recognized icons in the Social Media menu. Currently the way that we're solving this is to advise a modification to the theme config to add this capability.

Describe the solution you'd like
Add tel: links to the recognized "networks" array and replace them with the fa-phone icon.

	$networks['tel:'] = array(
		'name' => 'Call',
		'class' => 'call',
		'icon' => 'fa fa-phone',
		'icon-sign' => 'fa fa-phone-square',
		'icon-square-open' => 'fa fa-phone fa-phone-1x',
		'icon-square' => 'fa fa-imdb fa-phone-1x',
		'icon-circle-open-thin' => 'fa fa-phone fa-phone-1x',
		'icon-circle-open' => 'fa fa-phone fa-phone-1x',
		'icon-circle' => 'fa fa-phone fa-phone-1x',
		);

Describe alternatives you've considered
The current alternative is to advise the user to create a child theme and filter the BoldGrid configs to add the icon to the array of recognized networks.

Additional context
This feature was also requested by Charleston PR, a VIP BoldGrid Customer