Chapter 1: Commas in section starting "Slowly but surely..." Also, 2000's should be 2000s

[frostyweather]

Change:

Slowly but surely these concepts found their way into web designers’ workflows. In the early 2000’s we saw the introduction of libraries like YUI and jQuery UI, which provided developers with a toolkit of widgets and patterns to better create interactive interfaces.

To:

Slowly, but surely, these concepts found their way into web designers’ workflows. In the early 2000s we saw the introduction of libraries like YUI and jQuery UI, which provided developers with a toolkit of widgets and patterns to better create interactive interfaces.

[bukinoshita]

This can be closed, already merged.