Add the ability to set a custom value just typing into search field

Add the ability to set a custom value just typing into search field

- The new texts accept custom values;
- Add option to active that behavior adding a class "chzn-custom-value" to select or specifying an option "allow_custom_value"= true;
- The custom values are added a new group at the end of the option list;

Cakefile

@@ -50,10 +50,13 @@ write_chosen_javascript = (filename, body, trailing='') ->
   fs.writeFileSync filename, """
 // Chosen, a Select Box Enhancer for jQuery and Protoype
 // by Patrick Filler for Harvest, http://getharvest.com
-// 
+//
 // Version #{version()}
 // Full source at https://github.com/harvesthq/chosen
 // Copyright (c) 2011 Harvest http://getharvest.com
+//
+// Changelog:
+// [2012-08-02] - Add option to specify a custom value on the fly [Anderson Grüdtner Martins]
 
 // MIT License, https://github.com/harvesthq/chosen/blob/master/LICENSE.md
 // This file is generated by `cake build`, do not edit it by hand.
@@ -81,7 +84,7 @@ task 'build', 'build Chosen from source', build = (cb) ->
       cb() if typeof cb is 'function'
   catch e
     print_error e, file_name, file_contents
- 
+
 task 'watch', 'watch coffee/ for changes and build Chosen', ->
   console.log "Watching for changes in coffee/"
   for file in source_files()
@@ -154,7 +157,7 @@ print_error = (error, file_name, file_contents) ->
   else
     console.log """
 Error compiling #{file_name}:
-  
+
   #{error.message}
 
 """