Added new flags that follows modem state
Merge remote-tracking branch 'ruuvi/master' into interrupt
Small modifications.

Removed HW flow control. There is none on GPS uart.
Line handling now skips empty lines.
Modified LUA script to use new flag from gsm driver.

Signed-off-by: Tomi Hautakoski <thauta@iki.fi>
Add buffer sizes in gps and uart.