Add effect ease and duration parameters

## Introduction
I added 3 parameters to introduce new visuals effects.

## Parameters
- `effect`:  String of a jquery known effect. For now, only accept : `show`, `slide` and `fade`.  
- `duration`: A duration in millisecond, required to see animation running. (`duration=0` means no animation)
- `ease`: String of a jquery known easing function

## Configuration
You can either change them : 

- globally by setting them as jsBinder options :
``` js
$.jsBinder({ effect: "show", duration: "200", ease: "easeOut" });
```

- or specifically by adding `jb-` attributes :
``` js
<a href="#" jb-link="my-page.html" jb-effect="slide" jb-duration="400" jb-ease="linear">See my page!</a>
```
> __note:__ (this solution will always override global settings)

## Works with
- `jb-toggle` method
- `jb-link` methods
- `jb-form` methods