Not receiving push notification on android with parse.com

I am very new to android app development. I am using parse.com for my backend, and I have followed the tutorial https://www.parse.com/tutorials/android-push-notifications to set up push notifications. However, whenever I send a notification using parse notification console (on the website) or from an android device, I do not receive any notification. Secondly, on the parse notification console, each notification shows 0 as pushes sent. And when I checked the registration ID in the deviceToken field of the app's current ParseInstallation, it is empty. Even GCMSenderID is empty. So I am suspecting that my app is not getting registered properly, but installationID field is not empty. I have added all permissions and credentials in the manifest file.

Please help me. It will be a big help. Thank you :)

Here's my Manifest file:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />

<!--
  IMPORTANT: If you change the package name of this sample app, change
  "com.parse.tutorials.pushnotifications.permission.C2D_MESSAGE" in the
  lines below to match the new package name.
-->
<permission
    android:name="com.parse.swipeit.permission.C2D_MESSAGE"
    android:protectionLevel="signature" />

<uses-permission android:name="com.parse.swipeit.permission.C2D_MESSAGE" />

<application
    android:name="com.parse.swipeit.Application"
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.parse.swipeit.MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <service android:name="com.parse.PushService" />

    <receiver android:name="com.parse.ParseBroadcastReceiver" >
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
            <action android:name="android.intent.action.USER_PRESENT" />
        </intent-filter>
    </receiver>

    <receiver
        android:name="com.parse.GcmBroadcastReceiver"
        android:permission="com.google.android.c2dm.permission.SEND" >
        <intent-filter>
            <action android:name="com.google.android.c2dm.intent.RECEIVE" />
            <action android:name="com.google.android.c2dm.intent.REGISTRATION" />

            <!--
              IMPORTANT: If you change the package name of this sample app,
              change "com.parse.tutorials.pushnotifications" in the lines
              below to match the new package name.
            -->
            <category android:name="com.parse.swipeit" />
        </intent-filter>
    </receiver>
</application>