Allow finder options to be passed to elements

This allows you to specify options when `find`ing elements. For example, normally I would say:

```ruby
find '.radElement', wait: 30, visible: false
```

So now I can specify that wait option in my element definition:

```ruby
class MyPage < Capybara::Wheel::Page
  element 'CoolButton', '.radElement', wait: 30, visible: false
end
```