upgrade gradle plugin, fix crashes

app/src/main/java/com/naman14/timber/activities/MainActivity.java

@@ -198,9 +198,6 @@ public void run() {
             }, 350);
         }
 
-        if(!BillingProcessor.isIabServiceAvailable(this)) {
-            navigationView.getMenu().removeItem(R.id.nav_donate);
-        }
     }
 
     private void loadEverything() {
@@ -302,6 +299,10 @@ private void setupNavigationIcons(NavigationView navigationView) {
             navigationView.getMenu().findItem(R.id.nav_donate).setIcon(R.drawable.payment_white);
         }
 
+        if(!BillingProcessor.isIabServiceAvailable(this)) {
+            navigationView.getMenu().removeItem(R.id.nav_donate);
+        }
+
     }
 
     private void updatePosition(final MenuItem menuItem) {

build.gradle

@@ -6,7 +6,7 @@ buildscript {
         maven { url 'https://maven.fabric.io/public' }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.5.0'
+        classpath 'com.android.tools.build:gradle:2.1.0'
         classpath 'io.fabric.tools:gradle:1.+'
 
         // NOTE: Do not place your application dependencies here; they belong