Make a zip file with `make zip`
Bump the version number to 1.0.0
Mention the database-specific dbSkeleton
Write the Guide section
Rename confusing type PricingScheme -> PricingMatcher
Make the PricingScheme for a Company optional
Require arguments > 0 when accepting a variable number

Instead of `(xs: T*)`, write `(x:T, xs: T*)`.
Small fixes and indentation of the cheatsheet
Remove a TODO
Put the database tables in the Used API section
Loads of small corrections