Merge https://github.com/tomaka/glutin

Conflicts:
	.travis.yml
	Cargo.toml
	examples/fullscreen.rs
	src/api/android/mod.rs
	src/api/cocoa/headless.rs
	src/api/cocoa/helpers.rs
	src/api/cocoa/mod.rs
	src/api/glx/mod.rs
	src/api/osmesa/mod.rs
	src/api/win32/callback.rs
	src/headless.rs
	src/lib.rs
	src/platform/linux/mod.rs
	src/window.rs

src/platform/linux/api_dispatch.rs

@@ -17,7 +17,7 @@ use api::x11::XConnection;
 use api::x11::XError;
 use api::x11::XNotSupported;
 
-#[derive(Default)]
+#[derive(Clone, Default)]
 pub struct PlatformSpecificWindowBuilderAttributes;
 
 enum Backend {