making changes for new NOAA v2 API, added NEWS file, bumped ver number
added noaa_datacats fxn
changes to noaa_stations
removed cowsay from startup message
added fxn for datacategories endpoint
updated readme, fix to noaa_datacats
readme update
added travis file, and travis button to readme
moved tests from inst/tests/ to tests/testthat
added any missing and fixes tests, fixed dependencies
built vignette to html and pdf