tfarm binaries into .app folder by damies13 #1141 (modified) (#1993)
* Issue #1130 - tfarm binaries into .app folder
set CMAKE_RUNTIME_OUTPUT_DIRECTORY path for OSX so that when
add_subdirectory() calls add_executable(), the binaries know where they
need to be written so they are bundled into the mac .app folder
* copy tfarm binaries