Don't install xcode-select by default

Homebrew now installs xcode-select for you, so we don't need to manage
this part of the process ourselves.
Ask for sudo password before running script

It's a bit annoying to run the script and then come back to it 5 minutes
later with it asking for you to enter your password. Fix this by
preemptively asking user for password before kicking off script.
Clean up bootstrap/init

Removed some unnecessary whitespace.
Add remote install script

Similar to Homebrew, make Dot installable with a single shell command.