Update plugin_vulns.xml

Added code exec + others in iMember360is. I assume the name of the plugin is "infusion4wp" due to the fact that you can download a zip file from here http://docs.imember360.com/welcome/ which has that as the zip root folder.
Update plugin_vulns.xml

add <vulnerability> tag
Solve Git Merge conflict
Merge branch 'droope-patch-1'
Merge branch 'master' of https://github.com/wpscanteam/wpscan