v0.4.0

• Bug fixes:
  • fixed the captcha exception. The right exception is now returned when a captcha is found instead of an invalid response exception with status code "503".
  • fixed invalid type hinting causing errors with hhvm.
• Google updates:
  • bc break removed support for image captcha as google now uses recaptcha.
• Other:
  • When an invalid classical result is found, throw an exception instead of returning invalid results causing fatal errors.