Wefwef

Checking for document.visibilitystate and document.hidden don't work on iOS since JS gets "frozen" when the app is in the background.

Instead, use onpageshow for iOS.

Use onfocus for desktop.

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Holy crap binding refresh to onfocus was a bad idea.

Only refresh when onpageshow, which effectively means on mobile when you unlock/maximize the tab.

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Don't stop gulping when there's an error

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Show the time as `15m 3:30` instead of `in 15 minutes`

The @johntyree fix.

Fixes #51.