correct #199 fix
Merge pull request #202 from syohex/fix_helm-top

correct #199 fix
* helm-mode.el (helm-mode): Fix docstring.
Merge branch 'master' of github.com:emacs-helm/helm
* helm-sys.el: Remove `helm-sys-set-top-command', no more needed.
Give instead a default value that work for all shells to `helm-c-top-command'.
(helm-top-transformer): New, return empty string for invalid candidates.
( helm-c-source-top): Remove action attr no more needed.