Fixed: pass tests for MacOSX

[yoheimuta]

I could not understand why the previously passed tests made failures, so that I fixed only each direct causes.

• Changed the owner from root to travis to avoid a permission error 8949eeb
  • See https://travis-ci.org/yoheimuta/Redis-Fast/jobs/151999933#L306-L319
  • Excerpt from the link is below.

$ curl -L http://install.perlbrew.pl | bash
...
## Installing perlbrew
perlbrew is installed: ~/perl5/perlbrew/bin/perlbrew
mkdir /Users/travis/perl5/perlbrew/dists: Permission denied at perlbrew.v98ZuU line 121.

• Uninstalled a prebuilt perl installation of perlbrew 5396a5b
  • See https://travis-ci.org/yoheimuta/Redis-Fast/jobs/154030504#L626-L627 and https://travis-ci.org/yoheimuta/Redis-Fast/jobs/154030504#L102-L103.
  • The prebuilt perl is not available because this is broken ( https://travis-ci.org/yoheimuta/Redis-Fast/jobs/154030504#L297 ).
  • Excerpt from the link is below.

+echo 'Perl 5.14 already installed.'
Perl 5.14 already installed.

[shogo82148]

Thank you for your pull request :)

[yoheimuta]

Thanks!