removed references to rjson pkg #313
changed a few things in doc pages for get_pesiid and get-wormsid
chaned over 7 fxns to use jsonlite from RJSONIO, #313
chaned over 7 more fxns to use jsonlite from RJSONIO, #313
chaned over last 3 fxns to use jsonlite from RJSONIO, #313
removed RJSONIO from imports in DESCRIPTION file, closes #313