Implement captcha handler

[maZahaca]

It should:

• knows how to detect if captcha had happened (unexpected landing to captcha url or existing on the page captcha scope)
• knows scope of confirm button and input for enter captcha.
• take a picture of captcha (do base64 from picture in evaluate)
• has ability to set a promised function, which will determine captcha and return value.

Implement:

• does action back (if needed) and continue parsing

[maZahaca]

This going to be implemented in here goose-captcha-handler

[maZahaca]

@jifeon can you do this for me?

[maZahaca]

so, the idea is to have captcha, which will be initialized like that...
captcha(parser) -> this will add captcha action via Parser.addAction to the parser