Refactor proxy handling (#51)

This commit refactors the way proxy-ing requests through prepend.me works.
- dropped custom API client to prepend.me
- added configuration to openai-ruby gem to use prepend.me as base URL

Author: jelaniwoods

examples/13_conversation_features_comprehensive.rb

@@ -138,6 +138,22 @@
 puts "Response from loaded conversation: #{chat2.last[:content]}"
 puts
 
+puts "8. Creating multiple system messages:"
+chat3 = AI::Chat.new
+chat3.web_search = true
+puts "Message after first system message:"
+chat3.system("You speak like spider-man.")
+chat3.user("Where is the best place to get pizza in Chicago?")
+chat3.generate!
+puts "Response: #{chat3.last[:content]}"
+puts "\n\n"
+chat3.system("End every sentence with ✨")
+chat3.generate!
+puts "Message after second system message:"
+puts "Response: #{chat3.last[:content]}"
+puts
+
 puts "=" * 60
 puts "All conversation features demonstrated!"
 puts "=" * 60
+

examples/14_schema_generation.rb

@@ -108,7 +108,7 @@
 puts
 chat = AI::Chat.new
 chat.schema_file = "schema.json"
-if chat.schema.present?
+if chat.schema.is_a?(Hash)
   puts "✓ AI::Chat#schema_file= assigns AI::Chat#schema"
 else
   puts "✗ AI::Chat#schema_file= does not assign AI::Chat#schema"