Add unit conversion example code from Chapter 7 of 'The Joy of Clojure'.
Updated readers and data_readers.clj to allow use as a tagged literal
Java interop examples from Chapter 12 of 'The Joy of Clojure'
EDN read / read-string examples from Chapter 14 of 'The Joy of Clojure'
Moved specific examples from 'The Joy of Clojure' into a separate package.
Example files for simulation testing, from Chatper 14 of 'The Joy of Clojure'