Fix security issue #48

 Muestra la contraseña en la API 

http://tribus.canaima.softwarelibre.gob.ve/api/0.1/user/followers
http://tribus.canaima.softwarelibre.gob.ve/api/0.1/user/follows
Ejemplo:
```js
{
  "date_joined": "2013-12-09T23:07:50.807712",
  "description": null,
  "email": "luis@huntingbears.com.ve",
  "first_name": "Luis Alejandro",
  "id": 28,
  "is_active": true,
  "is_staff": false,
  "is_superuser": false,
  "last_login": "2014-01-29T23:41:42.651250",
  "last_name": "MartÃ­nez Faneyth",
  "location": null,
  "password": "{SSHA}Ktx/IPhqFZiMdA34HGPnNcSvxT95c2JUQXZGSg==",
  "resource_uri": "/api/0.1/user/follows/28",
  "telefono": null,
  "username": "luisalejandro"
}
```