[android] #2187 - added LeakCanary to Android test app

platform/android/MapboxGLAndroidSDKTestApp/build.gradle

@@ -70,11 +70,17 @@ dependencies {
     compile(project(':MapboxGLAndroidSDK')) {
         transitive = true
     }
+
+    // Support libraries
     compile "com.android.support:support-annotations:${supportLibVersion}"
     compile "com.android.support:support-v4:${supportLibVersion}"
     compile "com.android.support:appcompat-v7:${supportLibVersion}"
     compile "com.android.support:design:${supportLibVersion}"
 
+    // Leak Canary
+    debugCompile 'com.squareup.leakcanary:leakcanary-android:1.4-beta1'
+    releaseCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.4-beta1'
+
     // Testing dependencies
     testCompile 'junit:junit:4.12'
     testCompile 'org.mockito:mockito-core:1.10.19'

platform/android/MapboxGLAndroidSDKTestApp/src/main/AndroidManifest.xml

@@ -7,6 +7,7 @@
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
 
     <application
+        android:name=".MapboxApplication"
         android:allowBackup="true"
         android:fullBackupContent="true"
         android:icon="@drawable/icon_burned"

platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/MapboxApplication.java

@@ -0,0 +1,14 @@
+package com.mapbox.mapboxsdk.testapp;
+
+import android.app.Application;
+
+import com.squareup.leakcanary.LeakCanary;
+
+public class MapboxApplication extends Application {
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        LeakCanary.install(this);
+    }
+}