Directory Environment

[vlad-shatskyi]

Often we want to change environment variables for a particular directory (e.g. nvm, rvm). A directory environment, which would merge itself into environment and automatically clean up when you switch out of a CWD could make this task easier.

[lyonel]

This should be compatible with the direnv tool (which does exactly this). cf. https://direnv.net/

[dhollinger]

direnv doesn't appear to work in upterm