First release

This is a simple program I made because I am lazy.
It grabs all the source files in a given directory
recursively, grabbing any source files in child
directories and outputting them to be taken as the
input into gcc.

Usage:
sourcefiles <File extension 1> [File extension 2 ...]

Example:
$ sourcefiles ~/Projects/lmc/ h cpp

/home/ben/Projects/lmc/src/cpu.h /home/ben/Projects/lmc/src/main.cpp /home/ben/Projects/lmc/src/main.h

Peak lazyness but it works