Sorry but the app requires Samsung's framework, in other words you wouldn't be able to install it on your Nexus 5..
Perhaps a 3rd party alternative via play store.
Sent from my GT-I9505G using xda app-developers app
Phone: Galaxy S4(White)
Tablet: Galaxy Note 10.1 (White)
The Old: HD2, Samsung Galaxy S2, Galaxy Nexus
Xbox Live: Daymarez