Swap cgmath to nalgebra crate.

This helps converge the rust ecosystem onto `nalgebra`.

Cargo.toml

@@ -14,7 +14,7 @@ cpal = "0.8"
 hound = { version = "3.3.1", optional = true }
 lazy_static = "1.0.0"
 lewton = { version = "0.9", optional = true }
-cgmath = "0.14"
+nalgebra = "0.18"
 minimp3 = { version = "0.3.2", optional = true }
 
 [features]

src/lib.rs

@@ -83,12 +83,12 @@
 
 #![cfg_attr(test, deny(missing_docs))]
 
-extern crate cgmath;
 #[cfg(feature = "flac")]
 extern crate claxon;
 extern crate cpal;
 #[cfg(feature = "wav")]
 extern crate hound;
+extern crate nalgebra;
 #[macro_use]
 extern crate lazy_static;
 #[cfg(feature = "vorbis")]

src/source/spatial.rs

@@ -1,4 +1,4 @@
-use cgmath::{InnerSpace, Point3};
+use nalgebra::Point3;
 use source::ChannelVolume;
 use std::fmt::Debug;
 use std::time::Duration;