title: Calligraphy library by chrisjenx is not working
body: <p>I did what his documentation has instructed upon setting up the default font:</p>
  
  <pre><code> @Override
   protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setupDefaultFont();
  
          setContentView(R.layout.activity_main);
  
          setupToolbarAndNavigationDrawer();
    }
  
    public void setupDefaultFont() {
          CalligraphyConfig.initDefault(new CalligraphyConfig.Builder()
                          .setDefaultFontPath("fonts/OpenSans-Regular.ttf")
                          .setFontAttrId(R.attr.fontPath)
                          .build()
          );
    }
  </code></pre>
  
  <p>I also placed the fonts in <code>assets/fonts</code>, but to no avail.
  Roboto still shows up as default font and not Open Sans. I tried applying it manually one by one to each <code>TextView</code>, but still it doesn't work.</p>
  
  <p>Any ideas on why this doesn't work?</p>
  
  <p>More info: (In case it is useful)
  My miniSdkVersion is 15 and targetSdkVersion is 22.
  These are my dependencies:</p>
  
  <pre><code>dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
      compile 'com.android.support:appcompat-v7:22.2.0'
      compile 'com.android.support:design:22.2.0'
      compile 'com.android.support:recyclerview-v7:21.0.3'
      compile 'com.android.support:cardview-v7:21.0.3'
      compile 'de.hdodenhof:circleimageview:1.2.1'
      compile 'uk.co.chrisjenx:calligraphy:2.1.0'
  }
  </code></pre>
  
  <p>And this is the custom theme that I am using.</p>
  
  <pre><code>&lt;resources&gt;
      &lt;style name="myIIT_theme" parent="Theme.AppCompat"&gt;
          &lt;item name="colorPrimaryDark"&gt;@color/primary_dark&lt;/item&gt;
          &lt;item name="colorPrimary"&gt;@color/primary&lt;/item&gt;
          &lt;item name="android:textColorPrimary"&gt;@color/white&lt;/item&gt;
          &lt;item name="android:windowBackground"&gt;@color/tertiary_dark&lt;/item&gt;
          &lt;item name="android:activatedBackgroundIndicator"&gt;@drawable/selected_drawer&lt;/item&gt;
          &lt;item name="windowActionBar"&gt;false&lt;/item&gt;
          &lt;item name="windowNoTitle"&gt;true&lt;/item&gt;
      &lt;/style&gt;
  &lt;/resources&gt;
  </code></pre>