Fix android build and enable snapshots

Summary:
Fix some long-standing issues with the android build on Travis (and elsewhere)
and enable automatic publishing of snapshots.

Reviewed By: emilsjolander

Differential Revision: D5044001

fbshipit-source-id: f00be07f33c8018573af0b98233068ebd93360b4

.travis.yml

@@ -9,6 +9,9 @@ os: osx
 osx_image: xcode8.2
 language: cpp
 compiler: clang
+cache:
+  directories:
+    - $HOME/Library/Caches/Homebrew
 
 env:
   - TARGET=c
@@ -63,12 +66,8 @@ before_install:
       brew cask install java;
       export JAVA_HOME=$(/usr/libexec/java_home -v 1.8);
       export PATH=$JAVA_HOME/bin:$PATH;
-      brew install caskroom/cask/android-sdk;
-      export ANDROID_SDK=/usr/local/Cellar/android-sdk/24.4.1_1;
-      export ANDROID_HOME=/usr/local/Cellar/android-sdk/24.4.1_1;
-      brew install lib32stdc++6 lib32z1;
-      echo y | $ANDROID_SDK/tools/android update sdk --filter android-19,addon-google_apis-google-19,build-tools-19.1.0 --no-ui;
-      echo y | $ANDROID_SDK/tools/android update sdk -u;
+      source scripts/android-setup.sh && installAndroidSDK
+      export ANDROID_SDK=$ANDROID_HOME
     fi
 
   # JavaScript
@@ -114,7 +113,8 @@ script:
   # Android
   - |
     if [[ $TARGET = "android" ]]; then
-      buck build --verbose 0 //android/sample:sample
+      buck build --verbose 0 //android/sample:sample &&
+      scripts/publish-snapshot.sh
     fi
 
   # JavaScript