Example of a simple Cascalog flow on real-world data

Follow these steps to try it!

1. Get monthly historical weather data from the United States Historical
   Climatology Network (USHCN), at
   ftp://ftp.ncdc.noaa.gov/pub/data/ushcn/v2/monthly/ and save it under
   a path that is accessible by your Hadoop cluster.
2. Run `lein uberjar` to build a jar file that contains all dependencies
   for the job.
3. Submit the job to your Hadoop cluster:

       hadoop jar path/to/uberjar.jar \\
           cascalog_workshop.ushcn \\
           scheme://input/uri scheme://output/uri

4. Inspect the output part file(s) under scheme://output/uri/