title: Can't find android.support.design.widget.Snackbar in support design library
body: <p>I develop own library module where I use <code>Snackbar</code>. </p>
  
  <p>Here is my Gradle file:</p>
  
  <pre><code>apply plugin: 'com.android.library'
  
  android {
      compileSdkVersion 23
      buildToolsVersion "23.0.2"
  
      defaultConfig {
          minSdkVersion 14
          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-v7:23.1.1'
      compile 'me.zhanghai.android.materialprogressbar:library:1.1.4'
      compile 'com.android.support:design:23.1.1'
  }
  </code></pre>
  
  <p>As you can see, I have added <code>import com.android.support:design:23.1.1</code>, but as result I get error:</p>
  
  <blockquote>
    <p>error: package android.support.design.R does not exist</p>
  </blockquote>
  
  <p>How can I solve this problem?</p>