UTreeEvaluator: removed namespace boost::spirit and made some code style changes
UTreeEvaluator: removed namespace boost::spirit and made some code style changes

agra-uni-bremen/metaSMT,nbruns1/metaSMT,hoangmle/metaSMT,agra-uni-bremen/metaSMT,nbruns1/metaSMT,agra-uni-bremen/metaSMT,hoangmle/metaSMT,finnhaedicke/metaSMT,finnhaedicke/metaSMT,hoangmle/metaSMT,finnhaedicke/metaSMT,nbruns1/metaSMT