Upgrade LEAN Python to 3.6 from 2.7

- Adds log to display the python version the algorithm is using.
- Fixes python algorithms that were failing because of small subtleties
like leading zeroes.
- Updates pythonnet with a version compiled with python 3.6 flags

- Changes in DockerfileFoundation: we now use miniconda to manage the python
environment.
- Took the opportunity to add NTLK (#1349), Tensorforce (#1369) and
PyTorch/Pyro (#1385).
- Changes readme in Algorithm.Python to show steps to install miniconda

Algorithm.Python/BasicTemplateForexAlgorithm.py

@@ -40,7 +40,7 @@ class BasicTemplateForexAlgorithm(QCAlgorithm):
         self.SetCash(100000)
 
         # Start and end dates for the backtest.
-        self.SetStartDate(2013, 10, 07)
+        self.SetStartDate(2013, 10, 7)
         self.SetEndDate(2013, 10, 11)
 
         # Add FOREX contract you want to trade