Replace objc's Block with the standalone block crate.

Author: SSheldon

Cargo.toml

@@ -9,3 +9,4 @@ name = "objc_foundation"
 [dependencies]
 libc = "0.1"
 objc = "0.1"
+block = "0.0"

src/data.rs

@@ -4,7 +4,7 @@ use std::slice;
 use libc::c_void;
 
 use objc::Id;
-use objc::block::{Block, ConcreteBlock};
+use block::{Block, ConcreteBlock};
 use {INSObject, INSCopying, INSMutableCopying, NSRange};
 
 pub trait INSData : INSObject {

src/lib.rs

@@ -4,6 +4,7 @@
 extern crate libc;
 #[macro_use]
 extern crate objc;
+extern crate block;
 
 pub use self::array::{
     INSArray, INSMutableArray,