If there was a symlink to a directory fpm was incorrectly marking this
as a directory in the spec file and rpmbuild was erroring out.  This
fixes that by checking for symlinks and not adding them to the directory
list.
Merge pull request #522 from hatt/master

fix rspec deprecation warnings
Merge pull request #521 from nhuff/rpm_dir_fix

fpm creating invalid spec with symlinks to directories.