title: Travis CI Android build keep failing with gradlew no such file
body: <p>my travis ci build keeps failing with,</p>
  
  <p>$ chmod +x /.gradlew
  chmod: cannot access ‘/.gradlew’: No such file or directory
  The command "chmod +x /.gradlew" failed and exited with 1 during .</p>
  
  <p>I tried all the suggestions, different yml files but cant get rid of this error.</p>
  
  <p>My travis yml is on root directory, the here is my folder structure</p>
  
  <p>root: /src .gitignore .travis.yml</p>
  
  <p>src: /client /server</p>
  
  <p>client: /app /gradle/wrapper build.gradle gradle.properties gradlew gradlew.bat settings.gradle</p>
  
  <p>Here is my travis.yml</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>sudo: false
  language: android
  jdk:
    - oraclejdk8
  android:
    components:
      - tools
      - platform-tools
      - tools
  
      # The BuildTools version used by your project
      - build-tools-25.0.3
  
      # The SDK version used to compile your project
      - android-25
      - extra-google-google_play_services
      - extra-google-m2repository
      - extra-android-m2repository
      - addon-google_apis-google-19
  
  before_install:
    - chmod +x /.gradlew
  script:
  - "/.gradlew clean build"
  notifications:
    email: false</code></pre>
  </div>
  </div>
  </p>
  
  <p>and here is my build.gradle</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>// Top-level build file where you can add configuration options common to all sub-projects/modules.
  
  buildscript {
      repositories {
          jcenter()
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:2.3.3'
  
          // NOTE: Do not place your application dependencies here; they belong
          // in the individual module build.gradle files
      }
  }
  
  allprojects {
      repositories {
          jcenter()
          maven { url "https://maven.google.com" }
      }
  }
  task wrapper(type: Wrapper) {
      gradleVersion = '2.3.3'
  }
  
  task clean(type: Delete) {
      delete rootProject.buildDir
  }</code></pre>
  </div>
  </div>
  </p>
  
  <p>Any suggestions? Thanks</p>