Disable iOS build steps (#1019)

Summary:
These haven't built in ages now and causing all sorts of
down-stream issues with Greenkeeper and release jobs. We need to find
a more sustainable way of running them.
Pull Request resolved: https://github.com/facebook/flipper/pull/1019

Test Plan: eyes

Reviewed By: priteshrnandgaonkar

Differential Revision: D21066022

Pulled By: passy

fbshipit-source-id: 0480b7f17ed04af490113cf5dfbbfec130ec9eb3

.travis.yml

@@ -40,80 +40,3 @@ matrix:
         - yarn lint
         - yarn test
         - yarn build --linux --version=$TRAVIS_BUILD_NUMBER
-
-    - language: objective-c
-      podfile: iOS/Sample/Podfile
-      cache:
-        cocoapods: true
-        directories:
-          - $HOME/Library/Caches/CocoaPods/Pods/Release/
-
-
-      before_install:
-        - gem install cocoapods
-        - pod --version
-        - rm -f iOS/Sample/Podfile.lock
-        - rm -f iOS/Sample/build.log
-        - rm -f iOS/SampleSwift/Podfile.lock
-        - pod repo update --silent
-
-      install:
-        - cd iOS/Sample
-        - rm -f Podfile.lock
-        - travis_wait 30 pod install --silent
-        - cd ../../
-
-      script:
-        - cd iOS/Sample
-        - IPHONESIMULATOR=$(xcodebuild -showsdks | grep -o "iphonesimulator[0-9]\\+\\.[0-9]\\+$")
-        - travis_wait 30 xcodebuild build -workspace Sample.xcworkspace -scheme Sample -sdk $IPHONESIMULATOR -quiet > ./build.log
-        - tail -100 ./build.log
-
-    - language: objective-c
-      podfile: iOS/SampleSwift/Podfile
-      cache:
-        cocoapods: true
-        directories:
-          - $HOME/Library/Caches/CocoaPods/Pods/Release/
-
-      before_install:
-        - gem install cocoapods
-        - pod --version
-        - rm -f iOS/SampleSwift/Podfile.lock
-        - rm -f iOS/SampleSwift/build.log
-        - pod repo update --silent
-
-      install:
-        - cd iOS/SampleSwift
-        - rm -f Podfile.lock
-        - travis_wait 30 pod install --silent
-        - cd ../../
-      script:
-        - cd iOS/SampleSwift
-        - IPHONESIMULATOR=$(xcodebuild -showsdks | grep -o "iphonesimulator[0-9]\\+\\.[0-9]\\+$")
-        - travis_wait 30 xcodebuild build -workspace SampleSwift.xcworkspace -scheme SampleSwift -sdk $IPHONESIMULATOR -quiet > ./build.log
-        - tail -100 ./build.log
-
-    - language: objective-c
-      podfile: iOS/Tutorial/Podfile
-      cache:
-        cocoapods: true
-        directories:
-          - $HOME/Library/Caches/CocoaPods/Pods/Release/
-
-      before_install:
-        - gem install cocoapods
-        - pod --version
-        - rm -f iOS/Tutorial/Podfile.lock
-        - rm -f iOS/Tutorial/build.log
-        - pod repo update --silent
-
-      install:
-        - cd iOS/Tutorial
-        - travis_wait 30 pod install --silent
-        - cd ../../
-      script:
-        - cd iOS/Tutorial
-        - IPHONESIMULATOR=$(xcodebuild -showsdks | grep -o "iphonesimulator[0-9]\\+\\.[0-9]\\+$")
-        - travis_wait 30 xcodebuild build -workspace Tutorial.xcworkspace -scheme Tutorial -sdk $IPHONESIMULATOR -quiet > ./build.log
-        - tail -100 ./build.log