Added create_shared to Window
create_shared shouldn't copy the shared window
Shared windows don't get their contexts destroyed

Conflicts:
	src/private.rs
Merge branch 'master' of git://github.com/bjz/glfw-rs into shared

Conflicts:
	src/glfw.rs
Added comma after shared
Merge pull request #24 from Jeaye/shared

Support for shared contexts
Add `#[fixed_stack_segment] #[inline(never)]` attributes
Fix duplicate glfwDestroyWindow call in Drop impl

Probably a merge mistake
Update function pointer types for language changes
Use printfln! instead of println(fmt!(...))
Use Option type for nullable function pointers
Use .with_c_str instead of .to_c_str().with_ref
Merge branch 'master' of git://github.com/bjz/glfw-rs

Conflicts:
	src/glfw.rs