Remove the // operator so we can support perls before 5.10

Also added test case to cover our home-grown __dor() function.  I can't test this with dzil on 5.8.9 because some of your author plugins require 5.10.  But here's the output from prove on 5.8.9:

```bash
(1943)[jeff@callahan:Module-Faker]$ perl -e 'print "$]\n"';
5.008009
(1944)[jeff@callahan:Module-Faker]$ prove -l t
t/append-utf8.t .... ok   
t/append.t ......... ok   
t/basic.t .......... ok   
t/omit-file.t ...... ok   
t/provide-order.t .. ok   
t/requires.t ....... ok   
All tests successful.
Files=6, Tests=20,  4 wallclock secs ( 0.05 usr  0.02 sys +  3.62 cusr  0.25 csys =  3.94 CPU)
Result: PASS
```