Windows/WSL support

[jmalloc]

@alex-nicholas I couldn't see any use of ~ hardcoded into the makefiles. When you get a chance could you please send me a screenshot or log of the error messages you're seeing. No rush.

[alex-nicholas]

This is the bash output attempting to run make run-local in the project I'm working in. This may be specific to the makefile in this project more than make itself.

/usr/bin/sh: line 1: find-first-matching-file: command not found
/usr/bin/sh: line 1: find-first-matching-file: command not found
/usr/bin/sh: line 1: find-first-matching-file: command not found
/usr/bin/sh: line 1: find-first-matching-file: command not found
/usr/bin/sh: line 1: find-first-matching-file: command not found
/usr/bin/sh: line 1: find-first-matching-file: command not found
/usr/bin/sh: line 1: git-find: command not found
/usr/bin/sh: line 1: git-find: command not found
/usr/bin/sh: line 1: git-find: command not found
/usr/bin/sh: line 1: git-find: command not found
/usr/bin/sh: line 1: git-find: command not found
/usr/bin/sh: line 1: git-find: command not found
make: *** No rule to make target `next-dev', needed by `run-local'.  Stop.```

[jmalloc]

After some quick experimentation on Alex's machine, it seems that sub shells under git-bash are not inheriting the environment variables of the parent shell.