update to stop team mates complains
Merge pull request #39 from reem-utils/sergi_branch

update to stop team mates complains
Merge branch 'master' of https://github.com/reem-utils/robocup2014 into cris_branch
new version of detect_faces and learn_Test, and  upload recognize_face
update documentation of recognize_face
Merge pull request #40 from reem-utils/roger_branch

Roger branch
Merge branch 'master' of https://github.com/reem-utils/robocup2014 into cris_branch
new version of save_face. After learn a new face, it drops the database