Release 1.5.1

Bug fixes

• Made PlaceManagerImplTest independent of other tests
• Added RemovableSlot interface to NestedSlot
• Stop swallowing compile errors ApplicationControllerGenerator

Cleanup

• Small cleanup

Thanks to our contributors!

@BenDol
@Chris-V
@danielkaneider
@Elrhino
@meriouma
@olafleur
@rcpaul