Add default smiley and emoji styles

[justintadlock]

In version 5.0 of Hybrid Core, we no longer provide stylesheets. Therefore, we're missing the default styles for smileys and emojis.

Here's a look at the core styles that HC removes. We need to provide these (minus all the !important bits) in /resources/scss/utilities.

img.wp-smiley,
img.emoji {
    display: inline !important;
    border: none !important;
    box-shadow: none !important;
    height: 1em !important;
    width: 1em !important;
    margin: 0 .07em !important;
    vertical-align: -0.1em !important;
    background: none !important;
    padding: 0 !important;
}