Add support for binaries

[yrashk]

Not sure how exactly it should be done, binary-to-string? Special kind of object?

[yrashk]

Should it be done at all? Given that its support is now available through externs?

[benoitc]

Most of json objects arehandled in binaries.

actually if I do :

27> Global:set_value("obj",erlv8_object:new([{<<"test">>, <<"test">>}])).
{erlv8_object,[{<<"test">>,<<"test">>}],undefined}
28> Obj3 = Global:get_value("obj"). 
undefined

It won't work which is quite annoying.

[yrashk]

Good catch. Will fix.

[yrashk]

@benoitc, done in 906f10c