removed fbsimctl, update to xcode9

.travis.yml

 os: osx
-osx_image: xcode8.3
+osx_image: xcode9
 language: generic
 
 env:
   global:
-    - CODE_SIGNING_REQUIRED=NO
     - RCT_NO_LAUNCH_PACKAGER=true
 
 branches:
   - source ./scripts/env/installNode.sh
         # android sdk:
   - source ./scripts/env/installAndroidSDK.sh
-        # fbsimctl:
-  - source ./scripts/env/installFbSimCtl.sh
 
 script:
   - set -e

docs/docs/CONTRIBUTING.md

 curl --location https://dl.google.com/android/android-sdk_r24.4.1-macosx.zip | tar -x -z -C $HOME
 ```
 
-* fbsimctl:
-
-```
-export CODE_SIGNING_REQUIRED=NO
-brew tap facebook/fb && brew install fbsimctl
-```
 
 ## Basics - Getting Started
 

scripts/env/installFbSimCtl.sh

-#!/bin/bash -e
-
-brew tap facebook/fb
-brew install fbsimctl --HEAD

scripts/test.e2e.ios.js

 }
 
 function run() {
-  if (!exec.which(`fbsimctl`)) {
-    throw new Error(`fbsimctl must be installed: "brew tap facebook/fb && brew install fbsimctl"`);
-  }
   buildProjForDetox();
   e2e();
 }