enable the ruby concat script on Solaris

Per discussion on #174, Solaris 10 does not support the find/xargs
switches that were introduced in that PR (but Solaris 11 does).

+ add a shebang to concatfragments.rb
+ fix linter warnings/errors
Merge pull request #186 from jhoblitt/feature/rb_concat_solaris

enable the ruby concat script on Solaris