Add FontIcon bridge to AppIcons

Summary: Select a similar or better FontAwesome icon to represent each application

Test Plan: Visual inspection

Reviewers: epriestley, btrahan

Subscribers: hach-que, Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11489

src/applications/phpast/application/PhabricatorPHPASTApplication.php

@@ -11,7 +11,11 @@ final class PhabricatorPHPASTApplication extends PhabricatorApplication {
   }
 
   public function getIconName() {
-    return 'phpast';
+    return 'fa-ambulance';
+  }
+
+  public function getFontIcon() {
+    return 'fa-check-circle-o';
   }
 
   public function getShortDescription() {