Store and retrieve short URLs using the Shortn-url gem

require 'shortn-url'}

snurl = ShortnUrl.new('surl.xml')
snurl.full_url('http://www.wired.com/')
#=> aa

snurl.full_url('http://forrst.com/posts/Ban_IP_addresses_from_Asterisk-XDH')
#=> ae

snurl.short_url('aa')
#=> "http://www.wired.com/"

snurl.short_url('ab') # if a URI doesn't exist it will return an empty string
#=> ""

snurl.short_url('ae')
#=> "http://forrst.com/posts/Ban_IP_addresses_from_Asterisk-XDH"