ENH: MergeAdjacentImages and others with registration to use TubeTK/Reg
BUG: Fixed use of simple averaging
BUG: Params from EvoOpt weren't set correctly for GradOpt
ENH: Improved registration and option for fast blending (experimental)
BUG: Missing path to Slicer coded downloaded during build.

Slicer/Libs/ITKFatoryRegistration is built and used by SEMCLI.  Path to
.h files were missing.
Merge pull request #284 from aylward/Merge

Merge