Wrapper for captchabot API

captcha = Captchabot.wrapper(KEY)
captcha.phrase = 0 or 1 (0 default, 1 marks that at captcha 2-4 words)
captcha.regsense = 0 or 1 (0 default, 1 marks that text captcha is case sensitive)
captcha.numeric = 0 or 1 or 2 (0 default, 1 marks that text captcha consists only of numbers, 2 marks that on captcha no digit)
captcha.calc = 0 or 1 (0 default, 1 marks that digit  on captcha should be folded)
captcha.min_len = 0..20 (0 default, minimum length text captcha)
captcha.max_len = 0..20 (0 - unlimited, maximum length text captcha)
recognized = captcha.recognize(URL, EXT)
puts recognized[0] # ID recognized CAPTCHA
puts recognized[1] # Text CAPTCHA

captcha = Captchabot.wrapper('660aaf58948bae3fa81362ef71b9ebcc')
captcha.phrase = 1
recognized = captcha.recognize('http://www.google.com/recaptcha/api/image?c=03AHJ_Vuu-Kun_wMo4M8JiWA87K6awfoiUxJCUF9KkQq3tCfyxjYELhHcsIJrcJ_qgqIQQsBw5vWAkpHBqP4VEHv1nwtoAnD5uZvwzHknOFyID4OrX0_6q8QXQ5TwkRn7qBxdt3QdX6D8NvPcFHFHzmEhu1yCJJQfTwQ', 'jpg')
puts recognized[1]

puts Captchabot.balance(KEY)

captcha = Captchabot.wrapper('660aaf58948bae3fa81362ef71b9ebcc')
captcha.bad 'ID recognized CAPTCHA'

puts Captchabot.balance('660aaf58948bae3fa81362ef71b9ebcc')