Fix build due to changing socket.io types (#410)

package.json

@@ -702,8 +702,8 @@
 		"@types/mocha": "^2.2.32",
 		"@types/mongodb": "^2.2.9",
 		"@types/node": "^6.0.40",
-		"@types/socket.io": "^1.4.28",
-		"@types/socket.io-client": "^1.4.27",
+		"@types/socket.io": "^1.4.32",
+		"@types/socket.io-client": "^1.4.32",
 		"@types/d3": "5.0.0",
 		"antlr4ts-cli": "^0.4.0-alpha.4",
 		"azure-storage": "^2.8.1",

src/graph/GraphViewServer.ts

@@ -41,7 +41,7 @@ function truncateQuery(query: string) {
  * sockets.
  */
 export class GraphViewServer extends EventEmitter {
-  private _server: SocketIO.Server;
+  private _server: io.Server;
   private _httpServer: http.Server;
   private _port: number | undefined;
   private _socket: GraphViewServerSocket;

src/graph/GraphViewServerSocket.ts

@@ -3,11 +3,13 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
+import * as io from 'socket.io';
+
 /**
  * Wraps SocketIO.Socket to provide type safety
  */
 export class GraphViewServerSocket {
-  constructor(private _socket: SocketIO.Socket) { }
+  constructor(private _socket: io.Socket) { }
 
   public onClientMessage(event: ClientMessage, listener: Function): void {
     this._socket.on(event, listener);