Prep for Submodules

Signed-off-by: Seth Battis <SethBattis@stmarksschool.org>
PHP iCalendar Submodule

Structuring the repo in a more robust manner, with PHP iCalendar as its own (submodule) repository.

Signed-off-by: Seth Battis <SethBattis@stmarksschool.org>