emacs-helm.sh: resolve symlinks to get correct helm directory

This makes symlinks to emacs-helm.sh DTRT when executed.
Merge pull request #352 from michael-heerdegen/fix-349

emacs-helm.sh: resolve symlinks to get correct helm directory
* helm.el (helm-marked-candidates): Issue #333 Coerce marked-candidates.
Merge branch 'master' of github.com:emacs-helm/helm