Delete old autoloader

The application is ready to be installed through composer, otherwise,
end users should download Zend Framework 2 and configure it manually.
The production version should include the necessary dependencies, but
that, for now, does not happen.
Separate Zend Framework files and composer files.

From now also ignore "composer.lock" files.
Change README for vendors folder.
Add the autoloader.

Before it was in the old autoloader file.