[nem-en] Bugs in extension method implementation

[Kamil Skalski]

>
>    Dependence on the order of loading assemblies is very bad.

Of course, this wasn't intentional... ;)

>
>    > I'm not sure what is the perfect way to solve this.
>
>    Maybe at first load all assemblies, and already only then analyze them?

In case of /greedy- the current loading strategy suffices. But in case
of /greedy-  we should load assemblies in two stages: first only read
the assemblies and search for Extension attribute in them and then
load types.
This will take some time to do, but I think it is worth doing anyway.

-- 
Kamil Skalski
http://nazgul.omega.pl