Change ontology.items hash key from symbol :text to string 'text'.

[lavrovdv]

Archetype#concept_name use item[:text], but adl parser return item hash with key 'text'.

[skoba]

Thank you for pull request. However, I was wandering which is better hash key, String 'text' or Symbol :text, much when I implemented ADL parser. For better performance, key should be symbol, but in some cases, key needs pattern matching by regular expression. I selected string type key, but which do you think better?

[lavrovdv]

I think better way in this case use String keys. The use of Symbols does not have so much effect on performance this case.

[skoba]

Thank you for your kind advise. Спасибо!