title: Install curl and json extension in laravel
body: <p>I am creating a registration form, i want to add a google captcha to the form however i noticed that the package requires PHP 5.4 or greater and "ext-curl" and "ext-json" i have looked around to try and find out how to get these dependencies installed but i have found no solution, currently when i try adding the google captcha package to my composer.json and doing a composer.update i get an error then i have to take it out from my composer.jon file and re-run composer update to fix the error.  I think it might have something to do with these 2 dependencies does anyone know how i can get them installed?</p>
  
  <p>I use the inbuilt PHP server in Laravel on windows 7 platform.</p>