Release san (3)

• Fixed title view in NoteActivity layout.
• Added fade transitions between activities.
• Added snackbars in MainActivity for adding, removing and restoring the note.
• Added Undo option for removal snackbar, so it's possible to restore just deleted note.

Release ni! (2)

• Notes auto backup (Using Android AutoBackup)
• Some code optimizations

Release ichi (1)!

Simple notes app release!