Disable examples on no-std

Author: dhardy

examples/monte-carlo.rs

@@ -25,6 +25,9 @@
 //! the square at random, calculate the fraction that fall within the circle,
 //! and multiply this fraction by 4.
 
+#![cfg(feature="std")]
+
+
 extern crate rand;
 
 use rand::distributions::{Distribution, Range};

examples/monty-hall.rs

@@ -27,6 +27,9 @@
 //!
 //! [Monty Hall Problem]: https://en.wikipedia.org/wiki/Monty_Hall_problem
 
+#![cfg(feature="std")]
+
+
 extern crate rand;
 
 use rand::Rng;