Implement quote suggestion form

It will accept new quotes from captcha-approved users and put the quotes to the `queued_quote` table. There is also an `author` field that will contain the author IP address (or something alike).

It uses reCaptcha service that requires registration. I've already registered and I will fill the reCaptcha configuration parameters on our production server.
Currently it contains zero security, but some view logic (the render method) and controller logic (the check method). We will refactor it totally later - maybe so it can operate more straight with Play validation and for system.