Merge branch 'master' of github.com:yutingyw/jee-yuting-exercise

* 'master' of github.com:yutingyw/jee-yuting-exercise:
  changed file name
  changed file names
  delete class GT
Merge branch 'master' of github.com:jeeyoungk/jee-yuting-exercise

* 'master' of github.com:jeeyoungk/jee-yuting-exercise:
  Minor style fixup in ywprim.py
recursively "freeze" the returned tree - instead of using lists to store
children, use tuples.
Merge pull request #6 from jeeyoungk/2014-06-16-jee-jee-freeze-tree

recursively "freeze" the returned tree - instead of using lists to store
Implementation of the LCS

(Longest common subsequence)
Merge pull request #7 from jeeyoungk/2014-06-19-jee-implement-lcs

Implementation of the LCS
Merge branch 'master' of github.com:jeeyoungk/jee-yuting-exercise