Add Crashlytics NDK to Android

Closes #2107

Conflicts:
	Makefile
	android/java/MapboxGLAndroidSDKTestApp/build.gradle

android/java/MapboxGLAndroidSDKTestApp/build.gradle

@@ -76,6 +76,21 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+
+    splits {
+        abi {
+            enable true
+            reset()
+            include 'armeabi', 'armeabi-v7a', 'x86', 'mips'
+            universalApk true
+        }
+    }
+}
+
+crashlytics {
+    enableNdk true
+    androidNdkOut '../MapboxGLAndroidSDK/src/main/obj.target'
+    androidNdkLibsOut '../MapboxGLAndroidSDK/src/main/obj.target'
 }
 
 dependencies {
@@ -89,6 +104,9 @@ dependencies {
     compile('com.crashlytics.sdk.android:crashlytics:2.5.1@aar') {
         transitive = true;
     }
+    compile('com.crashlytics.sdk.android:crashlytics-ndk:1.1.1@aar') {
+        transitive = true;
+    }
 }
 
 checkstyle {

android/java/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxgl/testapp/MainActivity.java

@@ -24,6 +24,7 @@ import android.view.View;
 import android.widget.TextView;
 import android.widget.Toast;
 import com.crashlytics.android.Crashlytics;
+import com.crashlytics.android.ndk.CrashlyticsNdk;
 import com.mapbox.mapboxgl.annotations.Marker;
 import com.mapbox.mapboxgl.annotations.MarkerOptions;
 import com.mapbox.mapboxgl.annotations.PolygonOptions;
@@ -77,7 +78,7 @@ public class MainActivity extends AppCompatActivity {
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        Fabric.with(this, new Crashlytics());
+        Fabric.with(this, new Crashlytics(), new CrashlyticsNdk());
 
         // Load the layout
         setContentView(R.layout.activity_main);