Add unit test for json in2csv. Closes #77.
Add unit test for json in2csv. Closes #77.

nriyer/csvkit,jpalvarezf/csvkit,haginara/csvkit,matterker/csvkit,wjr1985/csvkit,bmispelon/csvkit,kyeoh/csvkit,Jobava/csvkit,gepuro/csvkit,themiurgo/csvkit,wireservice/csvkit,bradparks/csvkit__query_join_filter_CSV_cli,tlevine/csvkit,arowla/csvkit,onyxfish/csvkit,snuggles08/csvkit,aequitas/csvkit,barentsen/csvkit,unpingco/csvkit,KarrieK/csvkit,Tabea-K/csvkit,doganmeh/csvkit,archaeogeek/csvkit,dannguyen/csvkit,elcritch/csvkit,reubano/csvkit