Allow /web to be overwritten as the default directory for moodle installs

[kmoylanCA]

When working with this installer, it is forcing the installation to /web. It would be great if the root directory or install directory could be gotten from the composer.json file so that it can be configured for projects that use something other than /web (/docroot comes to mind).

Patch on the way...

[kmoylanCA]

patch_variable_docroot.txt

Here's a patch to allow the install directory to be defined in the composer.json like this:

"extra" : { "install-directory": "docroot" }