Added buffered IO

And updated tests to reflect this

src/wavereader.rs

@@ -13,7 +13,7 @@ use super::chunks::ReadBWaveChunks;
 use super::cue::Cue;
 
 use std::io::Cursor;
-use std::io::{Read, Seek};
+use std::io::{Read, Seek, BufReader};
 
 
 
@@ -68,13 +68,22 @@ pub struct WaveReader<R: Read + Seek> {
     pub inner: R,
 }
 
+impl WaveReader<BufReader<File>> {
+
+    pub fn open(path: &str) -> Result<Self, ParserError> {
+        let f = File::open(path)?;
+        let inner = BufReader::new(f);
+        Ok( Self::new(inner)? )
+    }
+}
+
 impl WaveReader<File> {
     
-     /// Open a file for reading.
+     /// Open a file for reading with unbuffered IO.
      ///
      /// A convenience that opens `path` and calls `Self::new()`
      
-    pub fn open(path: &str) -> Result<Self, ParserError> {
+    pub fn open_unbuffered(path: &str) -> Result<Self, ParserError> {
         let inner = File::open(path)?;
         return Ok( Self::new(inner)? )
     }