`get_installed_apps` messes up string offsets about pebblewatch HOT 3 OPEN

So evidently the way we're unpacking the installed apps message isn't correct anymore, see lib/pebble/watch.rb#L150.

My Pebble charging cable actually broke a little while ago, so I can't fix and test it myself. I would be very happy to accept a pull request addressing this, though.

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The unpack syntax is quite unreadable. I haven't really looked into it, but do you think moving to bindata (now that I pulled it in anyway) makes sense?

Where can I find documentation to the messaging/protocol syntax? Did you just extract it from the Python code?

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The #unpack syntax is just as unreadable as anything you don't know yet ;-) I can see how bindata is useful for larger structures like bundles (which I why I let you pull it in), but for smaller blobs with just a small number of values, my vote goes to #unpack.

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