Use MacVoikko as vendor string, not just Voikko (to avoid confusion with the other Voikko speller service implementation).
Changed handles key to use language string instead of ISO code. Fixes unknown language error.
Explicitly exclude libxmlpp in case it is installed - it will take precedence.
Merge pull request #2 from snomos/master

Changes to fix one bug, one hfst-ospell integration thing, and a more expclicit vendor tag.