WINDUP-152  Add support for Map<String, String> in Frames to store in vertex'es properties.
Merge branch 'WINDUP-152-MapInProps' of https://github.com/OndraZizka/windup into OndraZizka-WINDUP-152-MapInProps
Ran the Eclipse formatter on all classes in the commit
Merge branch 'OndraZizka-WINDUP-152-MapInProps'