gitignore: ignore .core files
Update CONTRIBUTORS
foreign: remove most commentary

Better to simply refer to the upstream
reference than add distracting clutter.
Remove grovel for now

More trouble than it is worth right now, enums can be added
manually later if needed.
Remove all but a few core bindings

It is better to grow the binding by demand than try to
cover everything in one go.
Restructure project layout
Add zoom bindings
Update README
Re-license under the MIT license
Add file headers
Adapt demo/simple-browser.lisp to webkit2