uploadfer: Validate and process uploaded image files

This class can be used to validate and process uploaded image files.

It can take an array of information of an uploaded file and validate it by checking the MIME type against a list of accepted MIME types.

The class can move the file to a given directory. It can also generate thumbnails when the images are files.

In Spanish:

Clase que se encarga de recibir los datos de un file recogido través de un formulario POST y los sube a la carpeta que se desee.

La clase hace distinciones de tipos mime de los archivos y permite generar thumbnails para las imagenes.