Added trading pairs ENVY, EXCL, LKNX, UTIL and removed a few

Added trading pairs ENVY, EXCL, LKNX, UTIL
Removed trading pairs CSO, FLT, FRAC, GDN, GIVE, GRK, MACD, MAST, PIGGY,
RIN
Added trading pairs ETC, UTC, VIK

Added trading pairs ETC, UTC, VIK