add versions to the dev requirements testthat and roxygen2
moved depends to imports. cuz we have to
toJSON methods are not :::, they are exported
remove aspect.R.  It is not needed
set base64enc to only import what it needs
import lattice so that xyplot is found
jsonlite's toJSON is exported. ::
add "base"... cuz why not
changed some import statements around in docs
added \dontrun for "divide" example
library'd datadr to make tests work, since it's imported now