Add DecisionTreeRegressor & RandomForestRegressor about tpot HOT 3 CLOSED

I looked at doing this briefly. From what I saw:

1. You would need to add new methods for feature selection for continuous data,
2. You would add a new function for each regressor along with their arguments, and add it to the primitives.

Here's a gist I made implementing an AdaBoostRegressor:
https://gist.github.com/Chris7/d46a57f03ed7507c59e6

Ultimately, TPOT should have a keyword indicate we are using continuous versus labeled data. Quite a bit of the guts need to be reworked for splitting the train/test set and feature selection for continuous data.

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Hi! Just wanted to acknowledge that I saw your issue and hope to get to it soon. @Chris7 is on the right track with his response.

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Okay, finally back from vacation! I'm happy to hear that you're excited about contributing to TPOT.

Looking at @Chris7's gist, he's right on the money. I'd imagine instead of having a special keyword passed to TPOT, we'd be better off implementing separate "classification" and "regression" versions of TPOT (e.g., TPOTRegressor and TPOTClassifier) that build off of a base TPOT object with the code that is shared between the two.

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