ANSI, colors and arbitrarity in messages added

    Full support for arbitrary positioning of balloon in pony files.

    ANSI colour sequences in pony files are applied only to the pony image,
    not the balloon link or the balloon itself.

    Support for colours in the message.

    Support custom balloon styles using the option '-b', '-B' will list all
    available. This list depends on whether you are invoking `ponysay` or `ponythink`.