clean up

labs/Lab5_NotificationsLab/.gitignore

labs/Lab5_NotificationsLab/Lab-Notifications.pdf

labs/Lab5_NotificationsLab/NotificationsLab.mp4

labs/Lab5_NotificationsLab/app/build.gradle

labs/Lab5_NotificationsLab/app/lint.xml

.../java/course/labs/notificationslab/tests/NewFeedTest.java

...abs/notificationslab/tests/OldFeedNoNotificationTest.java

...s/notificationslab/tests/OldFeedWithNotificationTest.java

.../Lab5_NotificationsLab/app/src/androidTest/res/.gitignore

labs/Lab5_NotificationsLab/app/src/main/AndroidManifest.xml

...ourse/labs/notificationslab/DownloadFinishedListener.java

.../course/labs/notificationslab/DownloaderTaskFragment.java

.../main/java/course/labs/notificationslab/FeedFragment.java

...in/java/course/labs/notificationslab/FriendsFragment.java

.../main/java/course/labs/notificationslab/MainActivity.java

.../java/course/labs/notificationslab/SelectionListener.java

...va/course/labs/notificationslab/TestFrontEndActivity.java

...otificationsLab/app/src/main/res/layout/activity_main.xml

...nsLab/app/src/main/res/layout/activity_test_front_end.xml

...ationsLab/app/src/main/res/layout/custom_notification.xml