lex: added grammar deduction from sentence string (single std::string). Returns vector of index start positions of the found subsentences matched to requested grammar.
lex: switched lookup() and grammar deduction to word_feature type
server: switched to word_feature type
lex: added grammar vector generation from single string of grammars like 'S,им V,пр S,мн'
lex: stdout debug cleanup
server: added parser for grammar option in request. return 'lemmas' and 'grammar' objects in json result