Fix build and all tests

examples/custom_types_and_methods.rs

@@ -1,5 +1,5 @@
 extern crate rhai;
-use rhai::{Engine, FnRegister};
+use rhai::{Engine, RegisterFn};
 
 #[derive(Clone)]
 struct TestStruct {

examples/repl.rs

@@ -3,7 +3,7 @@ extern crate rhai;
 use std::fmt::Display;
 use std::process::exit;
 use std::io::{stdin, stdout, Write};
-use rhai::{Engine, FnRegister, Scope};
+use rhai::{Engine, RegisterFn, Scope};
 
 fn showit<T: Display>(x: &mut T) -> () {
     println!("{}", x)

examples/rhai_runner.rs

@@ -2,7 +2,7 @@ use std::env;
 use std::fmt::Display;
 
 extern crate rhai;
-use rhai::{Engine, FnRegister};
+use rhai::{Engine, RegisterFn};
 
 fn showit<T: Display>(x: &mut T) -> () {
     println!("{}", x)

examples/simple_fn.rs

@@ -1,5 +1,5 @@
 extern crate rhai;
-use rhai::{Any, Engine, RegisterFn};
+use rhai::{Engine, RegisterFn};
 
 fn add(x: i64, y: i64) -> i64 {
     x + y