Enhancement: Several suggestions

[mastermunj]

Thank you for making this very good plugin. I'm trying to make a simple widget from it which can be used with Yii framwork.

I liked it so much that felt like giving in suggestions and hence registered myself onto github. :)

Following may improve this great plugin: Please ignore if they are discussed earlier.

1. Provision to set extra parameters for ajax call and also making default "tag" configurable would make it more ajax friendly.
2. When one starts typing, old list is shown until new data comes, which may or may not be desirable.
3. newel adds up duplicate value on top if exact typed word is present in auto complete list.

I'll try if I can make changes but I'm not sure if I will be able to code this well.