Fix inconsistencies that slipped through the cracks

[ghost]

I don't intend to spam this repository with shallow pull requests, but it looks like a few minor inconsistencies with the working groups were either introduced since I opened #127 or were simply overlooked. I believe I've fixed them now.

[ghost]

Some of my changes here are subjective; I thought that they made it seem more consistent/professional when looking at the site. If it's preferred that I revert them, let me know.

[Manishearth]

I don't think the working group names should be lower cased. The "Working Group" perhaps should be uppercased

[Mark-Simulacrum]

r? @Manishearth in that case, I personally don't really care either way.

[ghost]

I don't think the working group names should be lower cased. The "Working Group" perhaps should be uppercased

Should the whole title be like that, then?

[Manishearth]

Should the whole title be like that, then?

Yes

[nikomatsakis]

These do look like good changes -- I don't have a strong opinion about the capitalization of Working Group vs working group.