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 has been mentioned in both issue #152 and #92.
Hint: `^[[:blank:]]*" SYMBOL_IDENTIFIER "?[[:blank:]])?[Mm]odel` would be the first part but please try to understand it why and add the second part (media type) 

Note I am using http://regex.larsolavtorvik.com in the PHP POSIX mode