Replaced GPS Diode

Replaced gps diode from

http://www.mouser.com/ProductDetail/Diodes-Incorporated/1N4148WS-7-F/?qs=sGAEpiMZZMtoHjESLttvkr74rFM1mfYSUkQNUJ8i7JM%3d

to

http://www.digikey.com/product-detail/en/CDSW4148-G/641-1459-1-ND/3511544

Closed #38