Update README.md
Add U-blox SPI to PTY bridge utility
Add U-blox SPI to TCP bridge utility
Removed usleep from ublox-spi-to-tcp utility, increased SPI clock to 244KHz
Removed usleep from ublox-spi-to-pty utility, increased SPI clock to 244KHz
Restructure repository
Renamed ubx utility folders
GPS example dm to m height
added NAV_STATUS message support to the gps example