Added sketch for VM

DO NOT MERGE
This is just a sketch.
Please comment.
Removed.

On Wed, Dec 17, 2014 at 2:12 PM, Marko Mikulicic <notifications@github.com>
wrote:
>
> In src/internal.h
> <https://github.com/cesanta/v7/pull/43#discussion-diff-21973217>:
>
> >  struct v7 {
> > +  struct v7_object global_object;
> > +
> > +  struct v7_value execution_stack[50];
>
> I'd omit it for now, since the recursive AST interpreter doesn't need it.
>
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> <https://github.com/cesanta/v7/pull/43/files#r21973217>.
>