Support developer installation on linux

./bootstrap_dev.sh has a couple issues that prevent installation on linux

curl is required, as the install script downloaded from nix uses curl within it
Need to verify that paths are not OSX-specific
In some cases, it seems to output a line indicating that the detected OS is OSX Catalina
We may want to specify the single user installation (--no-daemon) as it installs nix.sh in the currently expected place, so it gets correctly added to the bash profile.

uwmisl / poretitioner