mutlitple order logic

[fedoralina]

closes #13 closes #15 closes #20 closes #12

• ask user for additional elements in order
• multiple order handled one by one of bot (ask to break down order)
• ask summary in the middle of the form (included in faq logic)
• ask for size and type details
• update deny and utter_anthing_else for better usability (removed utter message from action_total_order_add)
• include DucklingEntityExtractor to pipeline
• add ValidationAction logic for pizza ordering
• include function to make words from numbers num_to_word()
• class SharedVariables for flags in logic