moved documentation for CUDA version of softcascade
move gpu version of soft cascade to dedicated module
remove softcascade host dependencies on gpu module
softcascade: remove device dependency on gpu
remove generic version of GPU channel computer.
implement integral
fixed compilation with latest master changes
refactored cuda error handling; remove optional dependancies in soft cascade training app
Merge pull request #648 from cuda-geek:move-gpu-soft-cascade-to-softcascade-module