Added MyDigipass.com
Added mydigipass.png to img\identity
Added providers MyDigipass and VASCO png files
Added providers VASCO and MyDigipass
Added security sites Dome9 and Nexgate
Updated png files of nexgate and dome9
Removed Mydigipass from the providers and changed Dome9's website to http
Removed the Mydigipass logo from the providers directory
Removing Nexgate png & listing from security.yml
Merge branch '531', closes #531
Shorten Social Security name