Rectified error with load_HealthCanada_Opioid_Table() Changed email for Ankona: ankonanagpur (at) gmail.com
*Added codes so that just in case internet fails there is no error.
*Fixed bug with latest dates
*Fixed bug with json file location
*Fixed bug with load_FDA_Opioid_Table() and load_HealthCanada_Opioid_Table()
*Have added FDA Opioids and two new functions load_Opioid_Table and load_FDA_Opioid_Table to include US opioids as well.
*Have added @aliases OralOpioids-package to OralOpioids.R