add a hint
add hint/link to related stack overflow problem
fix typo
Added keynote slides
Revert "Updated with Rubinius Support"

This reverts commit 3ce23a8ee09f276e778aeab0c7b477b2e7b5a8ab.
Fix minor typo in method name: strings ARE unique objects
Remove trailing whitespace
Add koan on break statements
my_same_class_method => my_method_in_the_same_class for clarity
Added test for Hash default value. Developers often forget about using it.
Fix a typo in a method name.
Fix some typos.
Switched from MIT to CC by-nc-sa license.
Fixed links in license.
Another link fix
Final attempt on license link.
Now that the links are ok, fix the wording.
Fixed test_you_can_get_a_single_character_from_a_string for multiple rubies (1.8, 1.9)
Fixed missed test case.
Fix typo of subclasses (from subcases)