added drug classes

added the new HCV drug classes besides PI's which are already in there. based on HCV spec
added generic HCV drugs
added commercial HCV drugs
Added all drug links.
added abbreviations to drug_class.csv
viraferon 18M corrected in drug_commercial.csv
drug classes links added to drug_generic.csv
Merge branch 'master' of https://github.com/plibin/regadb
added Prezista 800mg
added *00mg line to coomercial and added Prezista - DRV in commercial-generic file
new HIV drugs

Added commercial drugs Stribild and Vitekta and changed the ATC code for Kaletra and added the ATC code for EVG in the generic drug file
Merge branch 'master' of https://github.com/plibin/regadb

Conflicts:
	regadb-install/drugs-csv/hiv/commercial_generic.csv
	regadb-install/drugs-csv/hiv/drug_commercial.csv