moved return hashes to named indexes, renamed show_* methods to get_*

[frapposelli]

• Moved return hashes to named indexes (easier to use) frapposelli
• Renamed show* methods to get* (easier to memorize) tsugliani

[astratto]

@frapposelli Thanks, it's a patch I wanted to write sooner or later. You should fix the tests, though...

[frapposelli]

forgot to add file to the commit :), will fix that.

[astratto]

Could you also use symbols instead of strings as hash keys, please?

[astratto]

Perfect, thanks!