Allow sile-sink to be build for packaging to npmjs.com and add more documentation and examples (#36)

Takes a package name and a dest path. This way we can more eassily change the
layout and it will error out on package name typos or missing packages.

They were hardcoded in more places

Add a scope so we don't have to care about naming conflicts
and set the verison to 0.1.0 since we don't have a stable API yet.

While it's nice to have a fixed chrome version it slows down the yarn install,
downloads a lot of things, and the chrome version depends on various
system packages so one needss to have chromium installed anyway.

This means developers that want to work on tests need firefox and chdomium installed.

Sadly I couldn't find a way to make browsers optional in case the developer
only has one installed.

Use tdd in all cases to be more consisstend.
Also since last year we can use chai with rollup directly, so
do that everywhere instead of relying on karma-chai injecting
it in to the global scope.

I couldn't find any breaking changes affecting us