Issue 1:
Flutter install started failing on iOS. Error output is not so helpful

Steps to Reproduce

ACA80F1A:litt lefty$ flutter build ios --release
Building io.lefty for device (ios-release)...
Running pod install... 5.8s
Running Xcode build... 65.2s
Built /Users/lefty/lefty/frontend/litt/build/ios/Release-iphoneos/Runner.app.
ACA80F1A:litt lefty$ flutter install
Installing io.lefty to Christian's iPhone...
Uninstalling old version...
Install failed
ACA80F1A:litt lefty$

Flutter Doctor

ACA80F1A:litt lefty$ flutter doctor
[✓] Flutter (on Mac OS X 10.12.4 16E195, channel master)
• Flutter at /Users/lefty/opt/flutter
• Framework revision 21f57a85e8 (11 hours ago), 2017-04-25 17:40:28 -0700
• Engine revision a5b64899c9
• Tools Dart version 1.23.0-dev.11.11

[✓] Host Executable Compatibility
• Downloaded executables execute on host

[✗] Android toolchain - develop for Android devices
✗ Unable to locate Android SDK.
Install Android Studio from https://developer.android.com/studio/index.html.
On first launch it will assist you in installing the Android SDK components.
(or visit https://flutter.io/setup/#android-setup for detailed instructions).
If Android SDK has been installed to a custom location, set $ANDROID_HOME to that location.

[✓] iOS toolchain - develop for iOS devices (Xcode 8.3.2)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 8.3.2, Build version 8E2002
• ios-deploy 1.9.1
• CocoaPods version 1.2.0

[✗] Android Studio (not installed)
• Android Studio not found. Download from https://developer.android.com/studio/index.html
(or visit https://flutter.io/setup/#android-setup for detailed instructions).

[✓] Connected devices
• Christian's iPhone • 9ad4d9bf38f10deb066f00ba77826ebb7b62d5dd • ios • iOS 10.3.1 (14E304)

Issue 2:
[myapp] flutter create myapp
Waiting for another flutter command to release the startup lock...
Creating project myapp...
myapp\.gitignore (created)
myapp\.idea\libraries\Dart_SDK.xml (created)
myapp\.idea\libraries\Flutter_for_Android.xml (created)
myapp\.idea\libraries\KotlinJavaRuntime.xml (created)
myapp\.idea\modules.xml (created)
myapp\.idea\runConfigurations\main_dart.xml (created)
myapp\.idea\workspace.xml (created)
myapp\.metadata (created)
myapp\android\app\build.gradle (created)
myapp\android\app\src\main\java\com\example\myapp\MainActivity.java (created)
myapp\android\build.gradle (created)
myapp\android\myapp_android.iml (created)
myapp\android\app\src\main\AndroidManifest.xml (created)
myapp\android\app\src\main\res\drawable\launch_background.xml (created)
myapp\android\app\src\main\res\mipmap-hdpi\ic_launcher.png (created)
myapp\android\app\src\main\res\mipmap-mdpi\ic_launcher.png (created)
myapp\android\app\src\main\res\mipmap-xhdpi\ic_launcher.png (created)
myapp\android\app\src\main\res\mipmap-xxhdpi\ic_launcher.png (created)
myapp\android\app\src\main\res\mipmap-xxxhdpi\ic_launcher.png (created)
myapp\android\app\src\main\res\values\styles.xml (created)
myapp\android\gradle\wrapper\gradle-wrapper.properties (created)
myapp\android\gradle.properties (created)
myapp\android\settings.gradle (created)
myapp\ios\Runner\AppDelegate.h (created)
myapp\ios\Runner\AppDelegate.m (created)
myapp\ios\Runner\main.m (created)
myapp\ios\Runner.xcodeproj\project.pbxproj (created)
myapp\ios\Runner.xcodeproj\xcshareddata\xcschemes\Runner.xcscheme (created)
myapp\ios\Flutter\AppFrameworkInfo.plist (created)
myapp\ios\Flutter\Debug.xcconfig (created)
myapp\ios\Flutter\Release.xcconfig (created)
myapp\ios\Runner\Assets.xcassets\AppIcon.appiconset\Contents.json (created)
myapp\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-1024x1024@1x.png (created)
myapp\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-20x20@1x.png (created)
myapp\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-20x20@2x.png (created)
myapp\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-20x20@3x.png (created)
myapp\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-29x29@1x.png (created)
myapp\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-29x29@2x.png (created)
myapp\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-29x29@3x.png (created)
myapp\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-40x40@1x.png (created)
myapp\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-40x40@2x.png (created)
myapp\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-40x40@3x.png (created)
myapp\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-60x60@2x.png (created)
myapp\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-60x60@3x.png (created)
myapp\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-76x76@1x.png (created)
myapp\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-76x76@2x.png (created)
myapp\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-83.5x83.5@2x.png (created)
myapp\ios\Runner\Assets.xcassets\LaunchImage.imageset\Contents.json (created)
myapp\ios\Runner\Assets.xcassets\LaunchImage.imageset\LaunchImage.png (created)
myapp\ios\Runner\Assets.xcassets\LaunchImage.imageset\LaunchImage@2x.png (created)
myapp\ios\Runner\Assets.xcassets\LaunchImage.imageset\LaunchImage@3x.png (created)
myapp\ios\Runner\Assets.xcassets\LaunchImage.imageset\README.md (created)
myapp\ios\Runner\Base.lproj\LaunchScreen.storyboard (created)
myapp\ios\Runner\Base.lproj\Main.storyboard (created)
myapp\ios\Runner\Info.plist (created)
myapp\ios\Runner.xcodeproj\project.xcworkspace\contents.xcworkspacedata (created)
myapp\ios\Runner.xcworkspace\contents.xcworkspacedata (created)
myapp\lib\main.dart (created)
myapp\myapp.iml (created)
myapp\pubspec.yaml (created)
myapp\README.md (created)
myapp\test\widget_test.dart (created)
Running "flutter packages get" in myapp...

Oops; flutter has exited unexpectedly.
Sending crash report to Google.
Crash report sent (report ID: 527fef08135ab7df)
Crash report written to C:\Users\Dell\Documents\FlutterProjects\flutter_01.log;
please let us know at https://github.com/flutter/flutter/issues.
exit code 1

flutter_01.log