Update to the last Rust api.

RngUtils is dead.
rustdoc_ng became rustdoc.

Makefile

@@ -16,7 +16,7 @@ bench:
 
 doc:
 	mkdir -p $(nalgebra_doc_path)
-	rustdoc_ng html src/lib.rs
+	rustdoc html src/lib.rs
 
 distcheck:
 	rm -rf $(tmp)

src/adaptors/rotmat.rs

@@ -1,5 +1,5 @@
 use std::num::{One, Zero};
-use std::rand::{Rand, Rng, RngUtil};
+use std::rand::{Rand, Rng};
 use std::cmp::ApproxEq;
 use traits::geometry::{Cross, Rotation, Rotate, RotationMatrix, AbsoluteRotate, Transform,
                        ToHomogeneous, Norm};

src/adaptors/transform.rs

@@ -1,5 +1,5 @@
 use std::num::{One, Zero};
-use std::rand::{Rand, Rng, RngUtil};
+use std::rand::{Rand, Rng};
 use std::cmp::ApproxEq;
 use traits::structure::{Dim, Mat, Col};
 use traits::operations::{Absolute, Inv, RMul};