Update nitrokey crate to 0.3.3

This change updates the nitrokey crate to version 0.3.3. Along with that
change we update rand to 0.6.4 because rand 0.6.1 does not yet contain a
publicly accessible rand_os. Note that we no longer require all
crates in rand's workspace, but only rand_os and rand_core, which is a
significant reduction in the number of lines of code compiled.

Import subrepo nitrokey/:nitrokey at 7cf747d56ddc0b7eeedc3caf36dcc909907a171c
Import subrepo rand/:rand at 4336232dda03323634b10ec72ddf27914aebc3a2

1 files changed, 11 insertions, 5 deletions

diff --git a/rand/src/rngs/thread.rs b/rand/src/rngs/thread.rs
index ff772e3..7977d85 100644
--- a/rand/src/rngs/thread.rs
+++ b/rand/src/rngs/thread.rs
@@ -87,10 +87,11 @@ thread_local!(
     }
 );
 
-/// Retrieve the lazily-initialized thread-local random number
-/// generator, seeded by the system. Intended to be used in method
-/// chaining style, e.g. `thread_rng().gen::<i32>()`, or cached locally, e.g.
-/// `let mut rng = thread_rng();`.
+/// Retrieve the lazily-initialized thread-local random number generator,
+/// seeded by the system. Intended to be used in method chaining style,
+/// e.g. `thread_rng().gen::<i32>()`, or cached locally, e.g.
+/// `let mut rng = thread_rng();`.  Invoked by the `Default` trait, making
+/// `ThreadRng::default()` equivelent.
 ///
 /// For more information see [`ThreadRng`].
 ///
@@ -99,6 +100,12 @@ pub fn thread_rng() -> ThreadRng {
     ThreadRng { rng: THREAD_RNG_KEY.with(|t| t.get()) }
 }
 
+impl Default for ThreadRng {
+    fn default() -> ThreadRng {
+        ::prelude::thread_rng()
+    }
+}
+
 impl RngCore for ThreadRng {
     #[inline(always)]
     fn next_u32(&mut self) -> u32 {
@@ -125,7 +132,6 @@ impl CryptoRng for ThreadRng {}
 #[cfg(test)]
 mod test {
     #[test]
-    #[cfg(not(feature="stdweb"))]
     fn test_thread_rng() {
         use Rng;
         let mut r = ::thread_rng();