title: NoClassDefFoundError on Calligraphy library
body: <p>After adding <code>compile 'com.android.support:support-v13:21.0.+'</code> to <code>build.gradle</code>, I had some conflicts on building my app, so I had to add <strong>multiDexEnabled = true</strong> to <code>defaultConfig</code> inside <code>build.gradle</code>. Those conflict are gone, but i got another exception (on opening the app) for the missing calligraphy library: </p>
  
  <pre><code>java.lang.NoClassDefFoundError: uk.co.chrisjenx.calligraphy.R$attr
          at uk.co.chrisjenx.calligraphy.CalligraphyConfig$Builder.&lt;init&gt;(CalligraphyConfig.java:150)
          at com.taxiyaab.android.util.ApplicationClass.onCreate(ApplicationClass.java:120)
          at newapp.com.taxiyaab.taxiyaab.PassengerApplication.onCreate(PassengerApplication.java:68)
          at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1007)
          at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4462)
          at android.app.ActivityThread.access$1500(ActivityThread.java:144)
          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1306)
          at android.os.Handler.dispatchMessage(Handler.java:102)
          at android.os.Looper.loop(Looper.java:212)
          at android.app.ActivityThread.main(ActivityThread.java:5135)
          at java.lang.reflect.Method.invokeNative(Native Method)
          at java.lang.reflect.Method.invoke(Method.java:515)
          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
          at dalvik.system.NativeStart.main(Native Method)
  </code></pre>
  
  <p>My latest sdk build tools version is <code>22.0.1</code>. Has anybody faced this issue before? </p>