Add autostart feature (fix #13)

AndroidManifest.xml

@@ -10,6 +10,7 @@
     <uses-permission android:name="android.permission.INTERNET"></uses-permission>
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>
     
     <application android:label="@string/app_name" android:icon="@drawable/ic_launcher" android:allowBackup="true">
         
@@ -27,6 +28,12 @@
         </activity>
         
         <service android:name="TraccarService" />
+        
+        <receiver android:name="AutostartReceiver">
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+            </intent-filter>
+        </receiver>
     
     </application>