Implement copy where needed

Cargo.toml

@@ -9,10 +9,14 @@ description = """
 Library to support the reading and writing of zip files.
 """
 
-[dependencies]
-flate2 = "*"
-bzip2 = "*"
-time = "*"
+[dependencies.flate2]
+git = "https://github.com/alexcrichton/flate2-rs"
+
+[dependencies.bzip2]
+git = "https://github.com/alexcrichton/bzip2-rs"
+
+[dependencies.time]
+git = "https://github.com/rust-lang/time.git"
 
 [[bin]]
 name = "extract"

src/compression.rs

@@ -1,7 +1,7 @@
 //! Possible ZIP compression methods.
 
 /// Compression methods for the contents of a ZIP file.
-#[deriving(FromPrimitive, Clone)]
+#[deriving(FromPrimitive, Clone, Copy)]
 pub enum CompressionMethod
 {
     /// The file is stored (no compression)