Bug#794634: Change package name

[Lumin <cdluminate@gmail.com>]

Control: retitle -1 ITP: meta-torch-core-free -- A scientific
computing framework for LuaJIT (core components)

Hi,

Since the torch project involves many components, I respectively
made packages for every core and free component. All the *core*
and *free* modules of Torch will be ready soon, and I plan to make
a metapackage src:meta-torch-core-free (bin:torch-core-free)
which pulls the whole torch core stack for the user.

So, lua-torch is actually not existing, this bug can be renamed to
meta-torch-core-free.


-- 
Best,
Lumin