Wrong/inflexible device detection

In Utils.java:218 there is a function getDeviceModel(), which returns 'flo' when the device is 'deb', which means that even if you use custom server, you can't download images for deb. Maybe you could enable this workaround only when the default address is used?

Also, 'tilapia' is on several places handled as 'flo' - that is wrong, tilapia is the 3G variant of 2012's version of Nexus 7 (grouper), so (Original --> 3G/4G Variant:):
grouper --> tilapia (Nexus 7 2012)
flo --> deb (Nexus 7 2013)

[1]: http://bazaar.launchpad.net/~humpolec-team/humpolec/UbuntuInstaller/view/head:/src/com/canonical/ubuntu/installer/Utils.java#L218