[closes #18] prepends Win32 device namespace to port names

Author: dcuddeback

src/windows/com.rs

@@ -40,7 +40,10 @@ impl COMPort {
  /// * `InvalidInput` if `port` is not a valid device name.
  /// * `Io` for any other I/O error while opening or initializing the device.
  pub fn open<T: AsRef<OsStr> + ?Sized>(port: &T) -> ::Result<Self> {
- let mut name: Vec<u16> = port.as_ref().encode_wide().collect();
+ let mut name = Vec::<u16>::new();
+
+ name.extend(OsStr::new("\\\\.\\").encode_wide());
+ name.extend(port.as_ref().encode_wide());
  name.push(0);
 
  let handle = unsafe {