moved upgrade trigger to admin_init action. firing on activation was …

…unreliable

see PressCrew/infinity-cbox#2

src/engine/ICE/loader.php

@@ -82,7 +82,7 @@ final static public function init( $ice_slug, $ice_url )
 				// add theme activation callback
 				add_action( 'load-themes.php', array( __CLASS__, 'do_activated_actions' ) );
 				// add upgrade callback
-				add_action( 'ice_theme_activated', array( __CLASS__, 'upgrade' ), 1 );
+				add_action( 'admin_init', array( __CLASS__, 'upgrade' ), 1 );
 			}
 		}
 	}