Take advantage of 2018 edition.

- Remove explicit 'extern crate' fields where useful
- Fix mutability of variable (unrelated?)
- Add rbxmx dependency, which needs 2018 edition

server/src/bin.rs

@@ -1,8 +1,5 @@
 #[macro_use] extern crate clap;
 #[macro_use] extern crate log;
-extern crate env_logger;
-
-extern crate librojo;
 
 use std::{
     path::{Path, PathBuf},

server/src/lib.rs

@@ -1,13 +1,8 @@
-#[macro_use] extern crate log;
-#[macro_use] extern crate rouille;
-#[macro_use] extern crate serde_derive;
-extern crate notify;
-extern crate rand;
-extern crate rbx_tree;
-extern crate regex;
-extern crate serde;
-extern crate serde_json;
-extern crate uuid;
+#[macro_use]
+extern crate log;
+
+#[macro_use]
+extern crate serde_derive;
 
 #[cfg(test)]
 extern crate tempfile;

server/src/rbx_session.rs

@@ -35,7 +35,7 @@ impl PathIdTree {
 
     pub fn insert(&mut self, path: &Path, id: RbxId) {
         if let Some(parent_path) = path.parent() {
-            if let Some(mut parent) = self.nodes.get_mut(parent_path) {
+            if let Some(parent) = self.nodes.get_mut(parent_path) {
                 parent.children.insert(path.to_path_buf());
             }
         }
@@ -48,7 +48,7 @@ impl PathIdTree {
 
     pub fn remove(&mut self, root_path: &Path) -> Option<RbxId> {
         if let Some(parent_path) = root_path.parent() {
-            if let Some(mut parent) = self.nodes.get_mut(parent_path) {
+            if let Some(parent) = self.nodes.get_mut(parent_path) {
                 parent.children.remove(root_path);
             }
         }

server/src/web.rs

@@ -4,7 +4,12 @@ use std::{
     sync::{mpsc, Arc},
 };
 
-use rouille::{self, Request, Response};
+use rouille::{
+    self,
+    router,
+    Request,
+    Response,
+};
 use rbx_tree::{RbxId, RootedRbxInstance};
 
 use crate::{