Attempt to solve 5.1
Merge branch 'master' of github.com:Haradwaith/Face-Recognition

* 'master' of github.com:Haradwaith/Face-Recognition:
  p and f are scalar, no .*
  Clean Task II
  Simplify BoostingAlg
  Optimize a little bit LearnWeakClassifier
  Clean debug of task I
Merge branch 'master' of github.com:Haradwaith/Face-Recognition

* 'master' of github.com:Haradwaith/Face-Recognition:
  Clean Task III