textium: fix mod visibility

textium/src/lib.rs

@@ -5,10 +5,10 @@ extern crate rusttype;
 extern crate glium;
 
 mod error;
-mod texture;
-mod geometry;
-mod rasterizer;
-mod packer;
+pub mod texture;
+pub mod geometry;
+pub mod rasterizer;
+pub mod packer;
 
 use std::iter::Iterator;
 use std::collections::HashMap;