Add initial iteration of Clojure number classifier from 'Functional Thinking' part 2
Implement sqrt optimisation in Functional Java and Java 8 classifiers.  Update test cases to check both classifier implementations.
Basic number classifier in Scala from 'Functional Thinking' part 3
Add example of currying in Groovy
Introduce intermediate package for all Number Classifier example source & test files
Example immutable Address class, with test to prove defensive copying of streets
Oh noes, a back door to mutating streets.  This is because we didn't defensively copy on construction.
Close the backdoor.