Merge pull request #34 from dozed/2.2

2.2
Merge pull request #35 from dozed/2.2

Added scroll to top script.
Merge pull request #36 from dozed/2.2

Fix for chrome.
Merge pull request #37 from dozed/2.2

Added tocs to guides.
Added guide layout to xml guide.
Added a standard unders construction partial. Closes #31.
Fixing location of partial. Really fixes #31.
Updating swagger guide to newest code.
Fixing specs2 quickstart links.
Added a note about constructor params.
Cleaning up text a bit.
Noted the constructor param stuff.
Formatting.
Update versions on front page.
Fixing comments.
Merge branch '2.2' of https://github.com/scalatra/scalatra-website into 2.2
s/pimp my library/extension methods/g

Extension methods are better known outside the Scala community, and
less likely to offend large swaths of the existing community.
Mention Scalatra 2.0.x for the stubbornly insistent.
Fix link rot.
Split the community menu so people can find "built-with".