Implemented search_in_response_to

[iamhssingh]

Implemented the concept of search_in_response_to in learn_reposne. If previous_statement is an instance of chatterbot.conversation.Statement, learning will save previous_statement.search_text as statement.search_in_response_to.

[iamhssingh]

Added logger statement, as pointed by @gunthercox

[iamhssingh]

@gunthercox anything here expected of me?

[gunthercox]

@iamhssingh Sorry about the wait, these changes look good and I'll merge them in shortly.

[gunthercox]

Actually, I just realized that this is missing unit tests. Is there any additional tests cases that can be added to cover these changes?

[iamhssingh]

@gunthercox Sure. I see this change has yet not been implemented. I will write the test cases & update the commit. I am sorry for being this late, bad times!

[iamhssingh]

@gunthercox Are you using in_response_to to search for an answer? Is there any specific logic adapter for that?

Here's the expected behavior of this logic adapter:
Say, I have a Statement having text = "Hi" and in_response_to = "Hello".

User: Hello
Bot: Hi # Found directly by searching Statement where in_response_to is Hello

[iamhssingh]

Actually, I just realized that this is missing unit tests. Is there any additional tests cases that can be added to cover these changes?

The test cases that are already there takes care of current implementation as well.