Adds support for https://github.com/faisalman/simple-excel-php
Adds code to include faculty leave dates in ldap feed.
Corrects missing comma
Adds faculty leave start and end dates to XSLT transform.
Moves `use` statement out of function block.
Adds the SimpleExcel library locally for now.
Hacks around the problem that Composer is not loadig SimpleExcel properly.
More Composer debugging.
Dispenses with SimpleExcel altogether.
Test aggregation of faculty leave data.