Do the various talents that improve our healing stack? Does anyone know if Imp Rejuv +15% and Gift of Nature +10% stack? Do they stack based on the original heal or on top of each other? As an example take a base heal of 100 hp

100 ---> original heal spell no modifiers
+ 15 ---> Improved Rejuvenation
+ 11 ---> Gift of Nature (calculated on 115 as the base)

or is it 100 + 15 + 10?