RaptHooker 0.9.1-beta.2

A beta of RaptHooker 0.9.1, for trying out what's coming.

Fixed

• Setting up a screen when the hub is on the 5 GHz band of a network that has the same name on 2.4 GHz: the screen was
  given the 5 GHz channel, and could fail to join ("couldn't join"). It now gets the network's 2.4 GHz channel.
  GET /api/screens/wifi has a new band field for the hub's own network.
• Screens a router turns away before they join ("couldn't join"), like one that only takes 802.11n: the screen now
  switches between 802.11g and n by itself after 10 s, as it already did when it joined but got no address. This is in
  screen firmware 1.1.2. A screen being set up gets it first, and set-up screens are offered it under Screens.