RTL Bootstrap for Arabic & Persian language with LESS

Hi This is a RTL Bootstrap LESS files

Note: I'm here use two direction in one file.
For example:
```css
p{
    color: @baseColor;
    margin-right: 5px;
    text-algin: left;
}
[dir=rtl] p {
    margin-right: 0;
    margin-left: 5px;
    text-algin: right;
}
```

The right to left style shows only of body has `dir` attribute equal to rtl
```html
<body lang="ar" dir="rtl">


</body>
```

Bat this code not work in IE6 :(