Merge src-N/ and src-pre-N/ and target API 24 (1/3)

Bug 29725318
Bug 29328819
Bug 29536552

Change-Id: I21854806fbf5c9a6e0fff3d12702bfaa96e04b26
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 3700c9f..72004a4 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -19,7 +19,7 @@
     android:versionCode="10505"
     android:versionName="1.5.5">
 
-    <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="23" />
+    <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="24" />
 
     <original-package android:name="com.android.contacts" />