Update custom attribute ToString()
Fix CA reader so it properly reads null args

Fixes #21
Respect framework version redirect when resolving assemblies
Fix not respecting framework version redirect when resolving MemberRef
Remove default args from methods
Small fixes

- Add missing null check
- Add option to disable framework DLL redirect code
- Add ITypeResolver.ResolveThrow() extension method with a sourceModule arg
Use GetSafeEnumerable()
Update 'this'-param when adding/removing methods from Methods prop

Fixes #22
Added get extended name method for methods
Merge remote-tracking branch '0xd4d/master'