General labelling

[xoseperez]

Several changes:

• Board must be named "Allwize K1"
• Make the while label zone bigger
• Increase font size, make it the same size as an Arduino
• Add as much GND as possible on both sides
• OSH logo (on top) (https://www.oshwa.org/open-source-hardware-logo/)
• "Made in BCN"
• Compliance logos (CE, ROHS)

[xoseperez]

@mfabregas: @gschelotto will need an Allwize logo in PNG format

[xoseperez]

Done with Rev.PB