geojson 0.3.4

fixes for test suite: skip package check warnings when geojsonlint not available, and skip tests that would use geojsonlint (#40)

geojson 0.3.2

package gains two new functions for working with newline-delimited GeoJSON: ndgeo_write() and ndgeo_read(). ndgeo_write() leverages writeLines() to write to disk, while ndgeo_read() leverages a modified version of jsonlite::stream_in() to stream in line by line. ndgeo_write() works only with the geojson package classes geofeature and geofeaturecollection (#31) (#38)
as.geojson() generic gains a new method for sf, see showMethods('as.geojson') to see methods available. The method is only available if you have sf installed (#30) thanks @cpsievert

add examples of using geobuf capabilities to the README (#35)
in as.geojson() now throw warning message from jsonlite when json is invalid to help user sort out what’s wrong with their JSON when the input is not valid JSON (#32)
speed up for an internal method asc() to use stringi::stri_replace_all() if installed, and if not fall back to using gsub()
replace usage of tibble::data_frame() with tibble::tibble() throughout package

change to print.geojson() to not calculate and print the bounding box because for very large geojson can take a very long time. Also changed to precomputing everything so printing geojson objects is fast (#36)
fix to geo_bbox() to handle negative coordinates (#33) (#34) thanks very much @aoles

gains new function to_geojson convert GeoJSON character string to the approriate GeoJSON class by detecting GeoJSON type automatically. this makes some other tasks easier (#28) (#29)

Improve as.geojson function to do print summary on all GeoJSON types well, not just GeometryCollection and FeatureCollection (#27)

Changed properties_add() to give back the same class object as that given to the function. In addition, correctly adds properties to FeatureCollection objects as well. (#22)
Added properties fxns tests

Fixed bug in print.featurecollection() that was not calculating and printing number of features correctly (#24)

Fixed bug in internal function that checked for existence of a Suggested package (#17)