Handle org-mode documents passed as args.

We were running into issues where the documents grew too large for being passed as a string to emacs, and we need to handle #+setupfile so we need to start handling org-mode documents as files and not just as anonymous streams of text.

The anonymous stream of text handling will remain because the automated tests use it.

build.rs

@@ -73,7 +73,7 @@ fn write_header(test_file: &mut File) {
 #[feature(exit_status_error)]
 use organic::compare_document;
 use organic::parser::document;
-use organic::emacs_parse_org_document;
+use organic::emacs_parse_anonymous_org_document;
 use organic::parser::sexp::sexp_with_padding;
 
 "#