Added SMS related functions.
Added SMS related functions.

snipesjr/gocryptotrader,jmaurice/gocryptotrader,dolanor/gocryptotrader,thrasher-/gocryptotrader,thrasher-/gocryptotrader,snipesjr/gocryptotrader,thrasher-/gocryptotrader,snipesjr/gocryptotrader,thrasher-/gocryptotrader,thrasher-/gocryptotrader,snipesjr/gocryptotrader