Added initial classes/interfaces for books and readers.
* Created symfony2-like folder structure.
* Composer is now handling autoloading.
* Added symfony/http-foundation package.
* Added css and js assets (that proxy hates me...)
* Added symfony/routing component
* Controllers are implemented using functions and view template names
  must match route names.
* Added routes for login, authenticate and logout actions.
* Added XML routing configuration (symfony/config)
Modified structure to reflect that controllers must return a Response.
Se agrega funcion para descarga de libros
Agregue mi ejercicio
Merge pull request #1 from MontealegreLuis/security_routes

* Added routes for login, authenticate and logout actions.
Agregue Save Book.
Mezclo aaciones de login con guardar libro
Merge pull request #2 from enriquehf/master

Pull Request
Se hace merge de descargar libro con guardar libro
Merge pull request #3 from kayec/master

Acción de descargar libro
Agregue compartir libro
Merge pull request #4 from Claud1a33/master

share-book
* Removed pages folder
* Fixed search books action
* Fixed some URL paths
Merged upstream.
Merged upstream with fixes.
Merge pull request #5 from MontealegreLuis/routing_config

Routing config