Merge pull request #316 from binsoftware/cocoa-fixes

Cocoa fixes: memory leaks, monitor handling, is_current()

src/window.rs

@@ -7,6 +7,7 @@ use CreationError;
 use Event;
 use GlRequest;
 use MouseCursor;
+use native_monitor::NativeMonitorId;
 
 use gl_common;
 use libc;
@@ -509,6 +510,12 @@ impl MonitorID {
         id.get_name()
     }
 
+    /// Returns the native platform identifier for this monitor.
+    pub fn get_native_identifier(&self) -> NativeMonitorId {
+        let &MonitorID(ref id) = self;
+        id.get_native_identifier()
+    }
+
     /// Returns the number of pixels currently displayed on the monitor.
     pub fn get_dimensions(&self) -> (u32, u32) {
         let &MonitorID(ref id) = self;