Enable fuzzy in helm-M-x (#145).
* helm-mode.el (helm-comp-read): Allow using fuzzy.
* helm-command.el (helm-M-x): Enable fuzzy.
* helm.el (helm-fuzzy-matching-default-sort-fn): Sort against real (#145).
* helm-source.el: Use helm-mklist.
* helm-mode.el (helm-comp-read): Fuzzy sort hist only when pattern is not empty (#145).
* helm-mode.el (helm-comp-read): Fix source arg name of sort fn.
* helm.el: Fix comment.