Vendor dependencies

Let's see how I like this workflow.

vendor/lazy_static/tests/no_std.rs

@@ -0,0 +1,20 @@
+#![cfg(feature="spin_no_std")]
+
+#![no_std]
+
+#[macro_use]
+extern crate lazy_static;
+
+lazy_static! {
+    /// Documentation!
+    pub static ref NUMBER: u32 = times_two(3);
+}
+
+fn times_two(n: u32) -> u32 {
+    n * 2
+}
+
+#[test]
+fn test_basic() {
+    assert_eq!(*NUMBER, 6);
+}