fix: fixes #380 by ripping out Android multidexing because of complications with Android Studio 2.3+

Author: ethanneff

build.gradle

@@ -16,7 +16,6 @@
     var mainActivityIndex = getMainLaunchActivityIndex(manifest['manifest']['application'][0]['activity'])
 
     // update manifest
-    manifest = updateMultidex(manifest)
     manifest = updateBranchMetaData(manifest, preferences)
     manifest = updateBranchReferrerTracking(manifest)
     manifest = updateLaunchOptionToSingleTask(manifest, mainActivityIndex)
@@ -57,14 +56,6 @@
     return manifest
   }
 
-  // adds to <application> for multidex (needed for all the frameworks)
-  //    <application android:name="android.support.multidex.MultiDexApplication" >
-  //    </application>
-  function updateMultidex (manifest) {
-    manifest['manifest']['application'][0]['$']['android:name'] = 'android.support.multidex.MultiDexApplication'
-    return manifest
-  }
-
   // adds to <application> for install referrer tracking (optional)
   //    <receiver android:name="io.branch.referral.InstallListener" android:exported="true">
   //       <intent-filter>