Added a script which creates LTR.h file

Trailing spaces removed

Dependency on object_utility.h removed from ltr/data/object.cc
ltr/data/utility/object_utility.h removed
Issues in create_header.py fixed

ltr/learners/linear_composition folder removed
create_header.py collects headers from ltr/ only

create-header.py renamed to create_header.py
create_header.py call added to CMake

Change-Id: I4a813a4ca3b0babdad7cee9e894b0dbc791f7bf5
Merge "Added a script which creates LTR.h file"