* use line comments instead of multiline comments for license header

* update more

* update new files

* more header updates

* style

* Done to achieve goal of having our #include directives all start
  with `"ngraph/`, like LLVM does.

Start of external function calling support

* Fixed the paths in the include statements

* absolute path include, relative to /src

* fix invalid use of incomplete type

* Fixed a compilation error.

All tuples are expanded out to their component tensors.

Output: Describes one tensor output of an node
Input: Described one tensor input to a node, including the output supplying the value.

update broadcast op args