Add an ocaml wrapper for find path1 ... pathN -name pattern

Summary: This is useful for finding all files recursively in a directory. I
started to do this in ocaml before I realized I was just reimplementing find.

Reviewed By: @bhosmer

Differential Revision: D1700338

Signature: t1:1700338:1418324335:119aac82f1323588778f77ab4a8fb9265d1df428
Remove list_classes support

Summary: Removing --list_classes support

Reviewed By: @jcreedcmu

Differential Revision: D1728617

Signature: t1:1728617:1418157029:68916eb05148efaf61be22e9190210b0b0dcf047