Initial version of H2 update for basic web development article.
Small edits.
Return mention about Derby, slightly rework DB set-up section.
Merge branch 'master' of git://github.com/clojuredocs/cds into basic-web-dev-h2
Addition to contributors section.
Merge pull request #101 from gsnewmark/basic-web-dev-h2

Use H2 in Basic Web Development tutorial (Issue #77)