added favicon link tag.
updated css.
updated resolution logic.
added photol.findFree test.
passed photo-api-create-test.
passed photo-api-del-test.
updated photo-identify-test.
passed user-api-find-test.
cache control only for GET method.
passed session-api-test.
changed some parameter ordering.
updated thank you.
renamed req.findUser to checkUser.