also support zepto

Author: jondavidjohn

README.md

@@ -91,7 +91,7 @@ bower install payform --save
 </script>
 ```
 
-### jQuery Plugin
+### jQuery Plugin (also supports Zepto)
 
 This library also includes a jquery plugin.  The primary `payform` object
 can be found at `$.payform`, and there are jquery centric ways to utilize the [browser

src/jquery.payform.coffee

@@ -1,6 +1,6 @@
 payform = require './payform'
 
-do ($ = jQuery) ->
+do ($ = window.jQuery || window.Zepto) ->
 
   $.payform = payform
   $.payform.fn =