Enable no default features test

We can now run the tests with default features disabled.

Author: tcharding

contrib/test.sh

@@ -20,8 +20,7 @@ cargo test --all
 
 if [ "$DO_FEATURE_MATRIX" = true ]; then
     cargo build --all --no-default-features
-    #This doesn't work but probably should --andrew
-    #cargo test --all --no-default-features
+    cargo test --all --no-default-features
 
     # All features
     cargo build --all --no-default-features --features="$FEATURES"