Fix wrong model recognition

Parser was recognizing words with `model` keyword combination, for example `` `model` `` or `Cmodel`, as model, this is a suggestion to fix the issue. this pull request would close issue #92 and #152.
@zdne your suggested regex would still recognize `cmodel` as `model` I not quite sure why but I can figure it out, as still I recall my suggested solution was the simplest that would work.