Expose instance level define through facade.

[ianterrell]

[Fixes #66]

[scottrobertson]

ahh cool, I forgot about about doing it in the Facade.

Shall get this merged and then will look at updating readme.

[scottrobertson]

Missing ; on line 74

[ianterrell]

Fixed with a forced update. Looks like CI is running again.

Guess I'm showing my Ruby roots. :)

[scottrobertson]

:P i keep doing it too, ; is awful :P.

I am going to merge this, but it requires a bit more work before it will work. Shall do that now.

[scottrobertson]

Or not, i got it working without changes :D updating docs etc now.

@philsturgeon @FrenkyNet @GrahamCampbell we need to decide if we want to remove the option of defining static $factory or factory(). I kind of want to get rid of it, but maybe not in this version.