Types with array range break JSON typesystem parsing

[jcklie]

If a typesystem uses an array for a range, it is encoded in the Json as

"tags" : {
        "%NAME" : "tags",
        "%RANGE" : "de.tudarmstadt.ukp.dkpro.core.api.metadata.type.TagDescription[]"
      },

The [] trips up the finding of types by name.