Porting Seeeduino Xadow to Arduino 1.6.3

I bought a Seeedstudio Xadow recently, and to get it to work with Arduino 1.6.3 was bit of a pain. Long story short, you can find the necessary files along with pithy instructions at my github repo.

The most crucial difference between the files Seeedstudio supplied and what is needed is that when referencing the core and variant, you must specify the vendor ID, or Arduino 1.6.3 will assume that you have custom source files in the vendor directory. In other words, instead of

Xadow.core=arduino

You must write

Xadow.core=arduino:arduino

This bit of information, along with others, is documented on arduino's github wiki, in particular Referencing another core, variant or tool.

Cheers,
Steve