Change up 'Build completed' message

This commit will change up the 'Build completed' message to make it
more thorough and kid-friendly. :)

Signed-off-by: Chintan Shah <cgintan1998@gmail.com>
Update SuperSU for DU [2/2]

Thanks to chinfire's "How to SU" guide,
I've managed to get SuperSU zip flashing on every
rom flash and it can easily be updated in
vendor_du

Change-Id: I0f57f8c2b8733021c3c0b9a5fd3c343ae565a959
Signed-off-by: LorDClockaN <davor@losinj.com>
Add in short VentureROM flashing message

Signed-off-by: Chintan Shah <cgintan1998@gmail.com>