Add a python based wizard

[benkrikler]

I had a first attempt at issue #19 over the weekend, and put together a command that runs similarly to the wizard but uses the executor.py code to run the commands. This means it can handle changing directory, passing environment variables, etc.

[codecov]

Codecov Report

Merging #21 into master will increase coverage by 4.73%.
The diff coverage is 82.79%.

@@            Coverage Diff            @@
##           master     #21      +/-   ##
=========================================
+ Coverage   70.06%   74.8%   +4.73%     
=========================================
  Files           8      10       +2     
  Lines         157     250      +93     
=========================================
+ Hits          110     187      +77     
- Misses         47      63      +16

Impacted Files	Coverage Δ
setup.py	0% <ø> (ø)	⬆️
wyriwyd/__main__.py	0% <0%> (ø)	⬆️
wyriwyd/interactive.py	93.75% <93.75%> (ø)
tests/test_interactive.py	96.96% <96.96%> (ø)

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