title: Could not integrate elegant number picker library
body: <p><a href="https://android-arsenal.com/details/1/4136" rel="nofollow noreferrer">https://android-arsenal.com/details/1/4136</a></p>
  
  <p>not able to integrate this library</p>
  
  <p>Stuck with this error - java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v4/os/BuildCompat;</p>
  
  <p>here's my gradle :</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
  compileSdkVersion 23
  buildToolsVersion "23.0.2"
  
  defaultConfig {
      applicationId "matrixdev.com.waitel"
      minSdkVersion 15
      targetSdkVersion 23
      versionCode 1
      versionName "1.0"
  }
  buildTypes {
      release {
          minifyEnabled false
          proguardFiles getDefaultProguardFile('proguard-android.txt'),        'proguard-rules.pro'
      }
  }
  }
  
  dependencies {
  compile fileTree(include: ['*.jar'], dir: 'libs')
  testCompile 'junit:junit:4.12'
  compile 'com.android.support:appcompat-v7:23.3.0'
  compile 'com.android.support:design:23.3.0'
  compile 'com.github.bumptech.glide:glide:3.6.1'
  compile 'com.google.code.gson:gson:2.4'
  compile 'com.android.support:recyclerview-v7:23.2.0'
  compile 'com.android.support:cardview-v7:23.0.+'
  compile 'com.cepheuen.elegant-number-button:lib:1.0.2'
  compile('com.android.support:support-v4:23.3.0') {
      force = true;
  }
  }
  </code></pre>