Changes:
 - Fixed bug which caused no arrows or vertices to be drawn when using the greek alphabet namegenerator.
 - Fixed bug which stopped parsing of relations
 - The arrowheadgraphics is now a class on its own
 - Introducing the CurvedArrowGFX class which draws curved arrows
 - Arrows in different directions between two verties will now be curved instead of overlapping.
Merge branch 'relations' of github.com:dybvik/qpaweb into relations