v0.13

[Ko vd Sloot]
bug fixes:

• fix for #35
• fix for #36

[Maarten van Gompel]
new features:

• FoLiA-wordtranslate.cxx: frog should be able to deal with
  spaces now, no need for ugly non-breaking space hack that now causes
  other problems in frog (LanguageMachines/frog#77)
• FoLiA-wordtranslate.cxx: adding ability to constrain by language