Implementation of hello(name)
Add test error messages.
Add two more special cases.
Add error descriptions to strings.
Implementation of starts_with_vowel?(str)
Implementation of starts_with_vowel?(str)
Fix bug in sum(array), implementation of max_2_sum(array).
Refactoring of max_2_sum
Refactoring of starts_with_vowel?(str)
Merge branch 'master' of github.com:ruby-course-may-2014/homework0