Core, Traversing: Add size & andSelf methods

Fixes jquerygh-62

Author: mgol

src/core.js

@@ -111,3 +111,9 @@ jQuery.sub = function() {
 	migrateWarn( "jQuery.sub() is deprecated" );
 	return jQuerySub;
 };
+
+// The number of elements contained in the matched element set
+jQuery.fn.size = function() {
+	migrateWarn( "jQuery.fn.size is deprecated; use the length property." );
+	return this.length;
+};

src/traversing.js

@@ -0,0 +1,4 @@
+jQuery.fn.andSelf = function() {
+	migrateWarn( "jQuery.fn.andSelf is deprecated; use jQuery.fn.addBack." );
+	return jQuery.fn.addBack.apply( this, arguments );
+};