Pin devpy and update commands to v0.1 API

[stefanv]

Please note that devpy will soon be renamed to spin due to PyPi name availability.

[codecov[bot]]

Codecov Report

Merging #251 (836fbb1) into develop (f476648) will decrease coverage by 0.11%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #251      +/-   ##
===========================================
- Coverage    57.12%   57.02%   -0.11%     
===========================================
  Files          103      103              
  Lines        11621    11621              
===========================================
- Hits          6639     6627      -12     
- Misses        4982     4994      +12     

see 7 files with indirect coverage changes

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