Initial add of nweamap data.  This data has anonymized KIPP Chicago data, names, RIT and Goal scores and ranges.
Anonymized DistrictName and TestID in nweamap.rda.
Changed class of nweamap to dataframe only.
Added documentation for nweamap dataframe.
Merge pull request #7 from chrishaid/add-nweamap-data

Add nweamap data