Merge branch 'develop' into a11y-improvements

# Conflicts:
#	dist/plyr.js
#	dist/plyr.js.map
#	dist/plyr.min.js
#	dist/plyr.min.js.map
#	dist/plyr.polyfilled.js
#	dist/plyr.polyfilled.js.map
#	dist/plyr.polyfilled.min.js
#	dist/plyr.polyfilled.min.js.map
#	src/js/controls.js
#	src/js/fullscreen.js
#	src/js/plyr.js
#	src/js/ui.js
#	src/js/utils.js

src/js/utils/time.js

@@ -0,0 +1,36 @@
+// ==========================================================================
+// Time utils
+// ==========================================================================
+
+import is from './is';
+
+// Time helpers
+export const getHours = value => parseInt((value / 60 / 60) % 60, 10);
+export const getMinutes = value => parseInt((value / 60) % 60, 10);
+export const getSeconds = value => parseInt(value % 60, 10);
+
+// Format time to UI friendly string
+export function formatTime(time = 0, displayHours = false, inverted = false) {
+    // Bail if the value isn't a number
+    if (!is.number(time)) {
+        return formatTime(null, displayHours, inverted);
+    }
+
+    // Format time component to add leading zero
+    const format = value => `0${value}`.slice(-2);
+
+    // Breakdown to hours, mins, secs
+    let hours = getHours(time);
+    const mins = getMinutes(time);
+    const secs = getSeconds(time);
+
+    // Do we need to display hours?
+    if (displayHours || hours > 0) {
+        hours = `${hours}:`;
+    } else {
+        hours = '';
+    }
+
+    // Render
+    return `${inverted && time > 0 ? '-' : ''}${hours}${format(mins)}:${format(secs)}`;
+}