Readme files on npm are very basic

[keeganstreet]

The main readme is in the root of the project, and we don't want to duplicate this in each package directory. But this means that when the packages are published to npm, they don't come with much of a readme. E.g:

Maybe we can have a prepublish script that copies the main readme file from the root of the project into each package directory prior to publishing to npm. It can remove it in a postpublish script.