Renamed "Tree Edit Distance" article to "Lazy Dynamic Programming".
Created a draft for my *future* tree edit distance post.

  - moved all the relevant pictures there
  - copied over the text about tree edit actions and post-order traversal
Updated my blog-post.hs script to work with GHC 7.8.2.

  - there were some parsing changes with multi-way if statements (?)
  - fixed the indentation and it worked!
  - next time, I need to remember to update the version in local/bin too!