install.sh: curl-pipe installer that clones to ~/.yadr, runs YADR's
native rake install, then layers personal dotfiles on top of $HOME
with backups on collision.
README.md: replace YADR's upstream readme with drunkendotfiles-
specific usage docs, credit, and refresh-from-upstream instructions.
Instead of asking the user to clone the repo and running rake
install, there's is now an easy .sh script that can be downloaded
and invoked in a single line.
The script takes a parameter "ask" if the use prefers to control
which modules of yadr are installed.