Actual tutorial results slightly different than shown

[olyerickson]

When viewing the byCounty summary the results are slightly different than shown in the tutorial. The actual summary is:

Distributed data frame backed by 'kvMemory' connection

 attribute      | value
----------------+-----------------------------------------------------------------------------------
 names          | fips(cha), time(Dat), nSold(num), medListPriceSqft(num), medSoldPriceSqft(num)
 nrow           | 224369
 size (stored)  | 16.45 MB
 size (object)  | 16.45 MB
 # subsets      | 2883

* Other attributes: getKeys()
* Missing attributes: splitSizeDistn, splitRowDistn, summary
* Conditioning variables: county, state

Note esp. the "missing attributes," which didn't show up before.