Modernize: Various version bumps for Seven Things

[farmdawgnation]

While preparing a talk on Lift I noticed that the Seven Things site could use some version bumps. So I went in and made some changes. There are a few things that are outstanding here. Specifically:

• The tests don't seem to pass. They don't seem particularly useful? Should we chuck them or...?
• I upgraded sbt since 0.11 won't run on Java 8 which more and more people are going to be switching to. We still have the old sbt-launch.jar in the repo but I'd like of like to nuke it altogether. Homebrew builds for sbt have gotten more reliable in recent days. Is there any value to having it?

[d6y]

Also: RunWebApp doesn't compile for me (but here's a version that does).

The XmlSourceSpecs.scala test: checking that the .html files are XML valid made a lot of sense pre-HTML. But now that we're using the HTML5 parser, less so. I suppose we could make the 27 failing .html files XML valid, but I don't think it's worth the effort. Better effort would be a HTMl5 validator. (It's OK -- I'm not suggesting adding one in this PR!)

[Shadowfiend]

Fun fact, the validator might be pretty straightforward with the HTML5 parser we have and the ErrorReportingTokenizer.

[farmdawgnation]

Why do we have specs running that check in this project anyway?

[Shadowfiend]

Whelp, just noticed this PR again. Right on time! <_<