Consistently clean up after .ready() handler, close gh-1135.

src/core.js

@@ -62,8 +62,9 @@ var
	},

	// The ready event handler and self cleanup method
	DOMContentLoaded = function() {
		document.removeEventListener( "DOMContentLoaded", DOMContentLoaded, false );
	completed = function() {
		document.removeEventListener( "DOMContentLoaded", completed, false );
		window.removeEventListener( "load", completed, false );
		jQuery.ready();
	};

@@ -770,13 +771,13 @@ jQuery.ready.promise = function( obj ) {
			// Handle it asynchronously to allow scripts the opportunity to delay ready
			setTimeout( jQuery.ready );

		// Standards-based browsers support DOMContentLoaded
		} else {

			// Use the handy event callback
			document.addEventListener( "DOMContentLoaded", DOMContentLoaded, false );
			document.addEventListener( "DOMContentLoaded", completed, false );

			// A fallback to window.onload, that will always work
			window.addEventListener( "load", jQuery.ready, false );
			window.addEventListener( "load", completed, false );
		}
	}
	return readyList.promise( obj );