added all possible fields to the params parameter in bison fxn
also added intneral fxn to check tomake sure acceptable param fields are given
bumped ver and date
fixed up bison_stats, data.frame output now correct
added dplyr to replace data.table
replaced plyr::compact with internal version, importfrom jsonlite fromjson now
fixed a few broken tesets
Merge branch 'master' of https://github.com/ropensci/rbison