Docs: it's package-install, not install-package
Fix: not using mapcar for effect
Paving the way to MELPA (and simpler ELPA generation)

Following the discussion in GitHub, i'm adding an alternative scheme
path to geiser.el as well as ##autoload cookies.  As a first benefit,
this simplifies a bit the elpa target, after playing a similar path
trick in bin/geiser-racket.sh.

Things should be almost ready for creating a MELPA recipe.
Missing autoload cookies for MELPA

Everything in geiser.el needs one, so that the generated
geiser-autoloads.el initializes variables and the like properly
automatically.
Fix file headers and footer for ELPA compatibility

This will allow `package-buffer-info` to parse the description out of the file.
News about MELPA support
Scheme version checks

And, if you happen to be launching it all the time, a way of skipping
them via a customizable variable.

Should address issue #15.
Credit where credit is due
Checking for versions before creating the REPL buffer

... so that we don't end up with a blank, useless buffer around.
Mentioning Xiao Hanyu's ac-geiser package in the docs
Learning to write