Update README.md

Fixed typo
Added splash screen and updated Touch icon
Updated touch icon

favicon-touch.png has some slight gradients. Use favicon.png as the
touch icon to not have any gradients.
Change to touch icon

Toned down the gradient slightly
Revert "Change to touch icon"

This reverts commit e1c454f96b477d3dc04a435c1cea8e4ed5f0b82a.
Revert "Update README.md"

This reverts commit ca540c3b3e82702dcb26edb2b1da2a6328ec663b.
Updated touch icon
Tapping weather story image now toggles Nowcast (if available)
Tapping the radar image shows the regional radar

Nowcast text now also displays by default, with a red bar below the
Weather Story to indicate that a Nowcast image is currently available.
Added banners for Nowcast and Regional Radar

Also added comments to code
Tweak to iframe widths
Changed text size

Also delayed displaying Weather Story image until it has loaded, so it
doesn't displace text once loaded. (The size of the images can vary over
time and depending on the station so the height can't be hard-coded.)
Tweak to image display
Update README.md
Merge remote-tracking branch 'origin/master' into gh-pages