merging master updates to dev (#119) (#120)

* Update rvn_download.R

Updated Raven url to https from http

* Update rvn_rvi_write_template.R

Added SAC-SMA template to rvn_rvi_write_template

* Minor fixes, added rvn_csv_read, added blended templates to rvi templates, updated .dat tables

closes #114
closes #117