BUG: Update SetupForDevelopment.sh and associated files for Github
COMP: Fix different CMake if/endif for TubeTK_USE_BOOST.
STYLE: Cleaned up GitSetup and hooks directories.
Merge pull request #41 from aylward/AddGitHooks

BUG: Update SetupForDevelopment.sh and associated files for Github
Merge pull request #44 from thewtex/USE_BOOST

COMP: Fix different CMake if/endif for TubeTK_USE_BOOST.
ENH: Tidy External_* files and enable upstream JsonCpp repository