Remove all features for 1.0 beta

src/lib.rs

@@ -1,6 +1,3 @@
-#![feature(collections, unsafe_destructor, core, std_misc, alloc)]
-#![unstable]
-
 //! The purpose of this library is to provide an OpenGL context on as many
 //!  platforms as possible.
 //!
@@ -26,6 +23,9 @@
 //!
 //! By default only `window` is enabled.
 
+#[macro_use]
+extern crate lazy_static;
+
 extern crate gl_common;
 extern crate libc;