Added one more example of reduce
Changed build.boot to use current Hoplon rendering methods
Updated styles

* New method `hlclj` to highlight with clojure chosen for code style
* New CSS class `.two-cols` for two column code rendering
Merge pull request #18 from cndreisbach/functions

Updated functions section
Merge pull request #19 from cndreisbach/plumbing

Starting to fix up styles and infrastructure
Add more content and exercise for seqs section
Merge pull request #20 from cndreisbach/seqs

Add more content and exercise for seqs section