Original ruby slippers images files.

Note that Xcode / iOS apps require PNG files; the .jpg's are the
original ones I downloaded off the internet.

 * ruby-slippers.png: the image from which all the current iOS app
   icons are derived
 * ruby-slippers-background.png: the icon I use for my Pushover app.
Checkpoint.  Still have several issues to resolve:

 * RS won't show up in Settings->Privacy->Location Services until it
   actually tries to *use* Location Services.  That is, checking for
   authorization is not enough -- you have to try to *use* them, and
   then the user is prompted with the alert "RS wants to use Location
   Services / do you want to allow?".  So if authorization comes back
   as "no", add logic to try to use LS and then check authorization
   again.
 * Similarly, need to think about how to check to see if a user has
   enabled LS for RS.  The OnLoad method doesn't seem to be
   enough... need to check somewhere else?  Need somewhere that is
   called whenever the app comes back into the foreground, I think...?
 * Need to resolve why LightBlue on multiple different devices is
   reporting a different UUID for the same device.  Is it not
   reporting the advertisement UUID?  I have emailed the
   punchthroughdesign people (authors of LightBlue) to ask.
 * For some reason, the CLBeacon functionality doesn't seem to be
   working for me.  :-(  I've tried on 3 different iDevices, and it
   rarely shows that we are "inside" the zone.  And when it *does*
   decide that we're "inside", it shows an NSArray of 0 beacons.  :-\
   I'm wondering if it's the specific BT nub I have, so I've ordered a
   different one to see if that one behaves differently.
 * While waiting for that new nub (which will take about a week --
   bummer!), might want to use CLBluetooth instead and directly
   receive BT advertisements and see if that is revealing at all.