Support scroll on terminal

Use [jquery-mousewheel](https://github.com/brandonaaron/jquery-mousewheel) version 3.1.12.
Merge pull request #1 from eitoball/support_scroll

Support scroll on terminal

Patch by Eito Katagiri. Thanks!!!
Add JavaScript style configuration for Emacs
Untabify
Use 2 spaces for an indent
Use " (double quote) for string literal
Update gems

    % bundle update
Add missing receiver
Remove a done TODO item!
change to use jQuery Terminal's mousewheel event handler

Even event receiver was missing in mousewheel event hander that was in
try-groonga.js at 2ad0518a43a45983166780456fd371563b089b78, terminal
seemed to respond to mousewheel event.

I investigated why and it turns out that:

```
All interpreters have attached mousewheel event so you can stroll them
using mouse.
```
"Additional terminal controls" in [API Reference](http://terminal.jcubic.pl/api_reference.php)

So, all you need to handle mousewheel event in jQuery Terminal is
just including jQuery Mouse Wheel Plugin.
update jQuery Terminal to 0.8.8