Fixed an R-devel warning by removing all `sprintf` calls in Rcpp code…

…; prepped for cran submission

added CRAN-SUBMISSION to .Rbuildignore (done automatically by devtool…

…s::release)

write_bed with append=TRUE debugged; replaced readr::read_table2 with…

… read_table (closes #4); replaced pryr::object_size with lobstr::obj_size (fixed vignette error)

minor edits in prep for CRAN resubmission

upped version, other prep for 2nd CRAN submission, minor Roxygen-rela…

…ted updates

updated comments to cran for resubmission

CRAN-requested corrections and etc, mostly writing examples/tests to …

…temp files