Added: `wunderground_twig_debug` filter.

You can force Twig debug mode by adding `add_filter(
'wunderground_twig_debug' '__return_true' );` to your theme's
`functions.php` file. You can also enable debug mode if you're logged
in as an Administrator by adding `?debug` to your current page's URL.
wunderground_parse_atts() function

* Fixed: Added checks to make sure `numdays` is always less than 10
* Added: `hidedata` attribute that works like `showdata`, but in
reverse. By default, all items are shown when embedding the shortcode
(conditions, precipitation %, icon, etc). If you want to hide the icon,
for example, you would add `hidedata="icon"` to the shortcode.
Template fixes

* Fixed: `table-horizontal` layout now works
* Fixed: `simple` template updated to use Chance of Precipitation
translation string
2.0.2 version bump!