cheat sheets.

# Annotations

* TODO to note missing features or functionality that should be added at
  a later date.

* FIXME to note broken code that needs to be fixed.

* OPTIMIZE to note slow or inefficient code that may cause performance
  problems.

* HACK to note code smells where questionable coding practices were used and
  should be refactored away.

* REVIEW to note anything that should be looked at to confirm it is working as
  intended. For example: REVIEW: Are we sure this is how the client does
  X currently?

* WTF to note that you don't understand something. Add your name to show who
  doesn't understand. Example WTF anders, Where does this method come from.