title: Could not find property 'VERSION_CODE'
body: <p>I want to use this library for my project and I got error when I try open this <a href="https://github.com/Clans/FloatingActionButton" rel="nofollow">library (FloatingActionButton) </a>source from Github. </p>
  
  <p>I download as zip this project when I tried to open the source code to understand it, I got this error:</p>
  
  <pre><code>Error:(10, 0) Could not find property 'VERSION_CODE' on project ':library'.
  </code></pre>
  
  <p>Add <strong>build.gradle</strong></p>
  
  <pre><code>apply plugin: 'com.android.library'
  
  android {
      compileSdkVersion 22
      buildToolsVersion "22.0.1"
  
      defaultConfig {
          minSdkVersion 14
          targetSdkVersion 22
          versionCode Integer.parseInt(project.VERSION_CODE)
          versionName project.VERSION_NAME
      }
      buildTypes {
          release {
              minifyEnabled false
              debuggable false
          }
  
          debug {
              minifyEnabled false
              debuggable true
          }
      }
  }
  
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
  }
  
  apply from: '../gradle-mvn-push.gradle'
  </code></pre>