Missing first letter of environment variable name

Unless I'm missing something, when I create a new Environment variabled, such as:

``` php
$env = Environment::getInstance();
$env->setUsername('myuser');
```

and then get it back out:

``` php
$env->getUsername();
```

I end up losing the first letter of the var name. Changing line 59 so that it reads as follows fixes the problem.

``` php
$index = strtolower(substr($name, 3));
```
