I'm trying to extend the Form class in L4.1 but I seem to be missing something. My file is named FormBuilder.php based on the API and is saved in app/libraries/extended/FormBuilder.php.
<?php namespace Extended;
class FormBuilder extends \Illuminate\Html\FormBuilder {
/**
 * Create a text input field.
 *
 * @param  string  $name
 * @param  string  $value
 * @param  array   $options
 * @return string
 */
public function text($name, $value = null, $options = array())
{
        $options = $options + array('id'=>"field-{$name}");
        return $this->input('text', $name, $value, $options);
}
}
This is actually the first time I've tried extending a core class in Laravel. I can't seem to put my finger on how to properly extend core classes like this Form class.
Edit:
I added "app/libraries/extended" to my composer.json file and ran both composer.phar update and composer.phar dump-autoload but it still seemed to be using the core class instead of my extended one. What am I forgetting to do?
To extend/swap a Laravel core class, you can create a Service Provider:
File: app/App/Libraries/Extensions/FormBuilder/FormBuilderServiceProvider.php
<?php namespace App\Libraries\Extensions\FormBuilder;
use Illuminate\Support\ServiceProvider as  IlluminateServiceProvider;
use App\Libraries\Extensions\FormBuilder\FormBuilder;
class FormBuilderServiceProvider extends IlluminateServiceProvider {
    /**
     * Indicates if loading of the provider is deferred.
     *
     * @var bool
     */
    protected $defer = true;
    /**
     * Register the service provider.
     *
     * @return void
     */
    public function register()
    {
        $this->app->bindShared('formbuilder', function($app)
        {
            $form = new FormBuilder($app['html'], $app['url'], $app['session.store']->getToken());
            return $form->setSessionStore($app['session.store']);
        });
    }
    /**
     * Get the services provided by the provider.
     *
     * @return array
     */
    public function provides()
    {
        return array('formbuilder');
    }
}
Create a Facade for it:
File: app/App/Libraries/Extensions/FormBuilder/FormBuilderFacade.php
<?php namespace App\Libraries\Extensions\FormBuilder;
use Illuminate\Support\Facades\Facade as IlluminateFacade;
class FormBuilderFacade extends IlluminateFacade {
    /**
     * Get the registered name of the component.
     *
     * @return string
     */
    protected static function getFacadeAccessor() { return 'formbuilder'; }
}
This would be your namespaced service class:
File: app/App/Libraries/Extensions/FormBuilder/FormBuilder.php
<?php namespace App\Libraries\Extensions\FormBuilder;
use \Illuminate\Html\FormBuilder as IlluminateFormBuilder;
class FormBuilder extends IlluminateFormBuilder {
    public function text($name, $value = null, $options = array())
    {
        $options = $options + array('id'=>"field-{$name}");
        return $this->input('text', $name, $value, $options);
    }
}
Open app/config/app.php and your Service Provider to the list
'App\Libraries\Extensions\FormBuilder\FormBuilderServiceProvider',
And replace Laravel's Form alias with yours
    'Form'            => 'App\Libraries\Extensions\FormBuilder\FormBuilderFacade',
To test I created a router like this:
Route::any('test', function() {
   return e(Form::text('first_name'));
});
And it gave me this result:
<input id="field-first_name" name="first_name" type="text">
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