Netcdf output addition 

This branch adds NetCDF as an output option for the dap_daily_stats in addition to geotiff. climates dependancies are available here: https://github.com/dblodgett-usgs/climates
Could you just use logical indexing? Looks like what occurs here is 

```R
x_vals[x_vals > 180] = x_vals[x_vals > 180] - 360
````

Also, this doesn't look like a test, looks like a transform.