Tests

[paulirish]

@jonathansampson wrote this to do a soft presence check of the console methods:
https://gist.github.com/jonathansampson/6954377

it also has results of edge browsers.

A test page with expectations would be next for us to capture here.

[bkardell]

something like that + firebase we could just generate rolling compat tables

[fitzgen]

something like that + firebase we could just generate rolling compat tables

+1

Could also test function length, where applicable.