chagned file names for new fxns
renamed files and fxns #10
fixed up all params to jive :ant:
reworked list_to_geo_list to output appropriate geojson structure, #10
added option to build geometrycollection instead of featurecollection if desired
bumped date
"as" methods for SpatialPoints and SpatialLines.

sp packaged does not have methods for as.SpatialPointsDataFrame.SpatialPoints or as.SpatialLinesDataFrame.SpatialLines (only as.SpatialPolygonsDataFrame.SpatialPolygons). This implements it for Lines and Points
geojson_write methods for SpatialLines and Points