Force training even if read_only is True

[rmdort]

This is just a proposal.

Scenario
Most of my clients want a training corpora but they dont want bots to auto-learn.

So when i am starting up the bot

bot = ChatBot('name', read_only=True)
bot.train('english') # Add corpus even if read_only is True

What do you think?

[karanluthra]

+1 for the use case. I often had to do run the chatbot twice, once with learning enable to learn from the corpus and then again with learning disabled for the user-facing deployment.

But should this be constrained to exist only for mongo storage adaptor? IMHO it will be useful for users of non mongo storage engines too.

[karanluthra]

Is this style consistent with rest of the code base?
I have seen foo=bar in method parameters at quite a few places in this code base.
Maybe @gunthercox could take the call.

[gunthercox]

I agree with @karanluthra, there should be no spaces when doing assignments in method parameters.

[gunthercox]

Tests are currently failing on this pull request so unfortunately I cannot merge it yet.