Add support for virtual environments

[Chris7]

Docs will be on another MR

[codecov-commenter]

Codecov Report

Attention: 30 lines in your changes are missing coverage. Please review.

Comparison is base (b113ef6) 77.12% compared to head (63a6951) 77.31%.

Files	Patch %	Lines
wooey/tasks.py	80.70%	7 Missing and 4 partials ⚠️
wooey/tests/scripts/venv_pandas_test.py	0.00%	11 Missing ⚠️
wooey/models/core.py	88.00%	2 Missing and 1 partial ⚠️
wooey/api/forms.py	66.66%	1 Missing and 1 partial ⚠️
wooey/tests/test_virtual_envs.py	96.61%	1 Missing and 1 partial ⚠️
wooey/admin.py	83.33%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #392      +/-   ##
==========================================
+ Coverage   77.12%   77.31%   +0.19%     
==========================================
  Files         139      143       +4     
  Lines        4856     5017     +161     
  Branches      649      666      +17     
==========================================
+ Hits         3745     3879     +134     
- Misses        969      989      +20     
- Partials      142      149       +7     

Flag	Coverage Δ
unittests	77.25% <83.85%> (+0.17%)	⬆️

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