Update composer lock file to match correct DocBlock version
Fixes #21: FileReflector crashes on bracketed global namespace

The FileReflector crashed when someone tries to declare the global
namespace using bracketed syntax because the application expects the
bracketed syntax to always have a name-part.

This commit fixes that by checking whether a namepart exists and by
declaring the namespace to be empty / global if absent.
Merge branch 'master' of github.com:phpDocumentor/Reflection