Installing composer dependencies
We use composer to install PHP dependencies. These are defined in the
file composer.json, the current dependency metadata is in composer.lock.
To fetch the dependencies:
* Get composer.phar as described at
* run [path_to]/composer.phar install in the webroot.
This will install all required dependencies to the directory vendor.
The vendor directory is listed in .gitignore to avoid committing
duplicates of upstream projects.