Spin modification to accomodate languages other than R

[Hemken]

A proposed solution to #1773:

A test with Python is:

(spinpythontest.py)

# Using python directly
python <- "C:/ProgramData/Anaconda3/python.exe"

#+ engine = "python", engine.path = python
import os
os.getenv("RSTUDIO_PANDOC")

I recognize that this is not a valid python script, but it serves to test spin(). On your computer, the Python path may/will need to be adjusted!

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:white_check_mark: Hemken
:white_check_mark: yihui
:x: Douglas Hemken

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