fadeTo: change Callback to Function return type and rename to complete

Author: kswedberg

entries/fadeTo.xml

@@ -10,7 +10,7 @@
     <argument name="opacity" type="Number">
       <desc>A number between 0 and 1 denoting the target opacity.</desc>
     </argument>
-    <argument name="callback" type="Callback" optional="true">
+    <argument name="complete" type="Function" optional="true">
       <desc>A function to call once the animation is complete.</desc>
     </argument>
   </signature>
@@ -25,7 +25,7 @@
     <argument name="easing" type="String" optional="true">
       <desc>A string indicating which easing function to use for the transition.</desc>
     </argument>
-    <argument name="callback" type="Callback" optional="true">
+    <argument name="complete" type="Function" optional="true">
       <desc>A function to call once the animation is complete.</desc>
     </argument>
   </signature>
@@ -132,4 +132,4 @@ div { background:blue; }
   <category slug="effects/fading"/>
   <category slug="version/1.0"/>
   <category slug="version/1.4.3"/>
-</entry>
+</entry>