added missing param args across fxns for new api, changed all name fxns to have prefix name_, added occ_metadata search fxn
changed default cols in occ_search to get occurrence key in addition to name,lat,long
added name_lookup back, got deleted somehow, editing tests
added test for name_usage fxn
moved actual vignettes to inst/stuff and replaced vignettes/ with a file with links to vignettes on the web
moved tests to tests/testthat, updated version to 0.3.9