Round precipitation rate output to nearest 0.1

Using the 'round_any' function from the plyr package
for rounding to an interval.
Include require statement for plyr package

Included at head of 'ncdc.station.data' function.
Write code to determine the precipitation code

Calculated the precipitation code using ambient
temperature at station and the rainfall rate in
mm/hr. Split into 6 categories for snow and liquid
precipitation (light, moderate, and heavy). Inserts
vector 'PRECIP.RATE' into 'data' data frame.