KiCad project

This commit adds the complete KiCad project, including:
 - KiCad project file (.pro)
 - schematic (.sch)
 - Net list (.net)
 - Component to module file (.cmp)
 - PCBnew board file (.brd)
The vusbtiny3v3p.brd is the panelized version of the board using
panelize.py (see cjlano/kicad-utils repository)