grim/envconfig2

merging
v0.4
2017-08-30, Gary Kramlich
cadc3387311f
merging
38829efb5c158274ac26a8efff4acbc8f5ca46bc v0.1
e48e6578bd847093eb7ed4e049c76a9b977c2a5c v0.2
11f381cdb6cef679ac6ce21bf051e0f98033069f v0.3
fc9667561a6c40a0f2bd2229d2a9f8c0c4569b72 v0.4