Add ui-commit.c + misc ui cleanups

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

cgit.c

@@ -32,6 +32,8 @@ static void cgit_print_repo_page(struct cacheitem *item)
 		cgit_print_log(cgit_query_head, cgit_query_ofs, 100);
 	} else if (!strcmp(cgit_query_page, "tree")) {
 		cgit_print_tree(cgit_query_sha1);
+	} else if (!strcmp(cgit_query_page, "commit")) {
+		cgit_print_commit(cgit_query_sha1);
 	} else if (!strcmp(cgit_query_page, "view")) {
 		cgit_print_view(cgit_query_sha1);
 	}