Checkbox field styling

[JiveDig]

The checkbox field would look much better, and be much more usable, if it were styled like the multicheck_inline field, but obviously with only 1 value.

Here is the checkbox field (last field in form):

Here is the multicheck_inline field with 1 option:

I would just use the multicheck_inline field but it doesn't parse correctly, I just need boolean but it's returning an array, naturally. I could filter with `_shortcode_fields, but then when I edit, it doesn't load correctly.

The easiest things seemed to be more consistent form styling for checkbox fields.

Let me know what you think.

[jtsternberg]

I agree, that does look much cleaner. Would you be willing to issue a PR? https://github.com/jtsternberg/Shortcode_Button/blob/master/css/shortcode-button.css