Add Find#beers.

http://www.ruby-doc.org/stdlib-1.9.3/libdoc/find/rdoc/Find.html

Obviously, we want to be able to find beers.
If you give upper limit for random beers, you'll know you want the max number of them anyway
Support for the new standard 30-pack aimed at finnish tourists visiting Estonia
Merge pull request #2 from tkareine/random_beers_with_limit_means_max_number_of_beers

If you give upper limit for random beers, you'll want max number of them anyway
Merge pull request #1 from steveklabnik/patch-2

Add Find#beers.
Merge pull request #3 from refiito/master

30-pack support
Support 18-pack
Merge pull request #4 from Mumakil/18-pack

Add support for 18 pack
Add javascript support