Update bigdataclass.org example1 to new Java API. Add new subfolder for answer keys
Update Task 1 to tutorial format (- full answer, + hints and comments) - BigDataClass.org
Update Task TWO to tutorial format (- full answer, + hints and comments) - BigDataClass.org
Update Task THREE to tutorial format (- full answer, + hints and comments) - BigDataClass.org
Correct typos, add minor documentation, change user instructions in ReduceToVector
Merge pull request #12 from mariemayadi/update-tutorial

Update Java exercise to new API