Add Brian Candler to the authors list

snf-image-host/AUTHORS

-Nikos Skalkotos <skalkoto@grnet.gr>
-Dimitris Aragiorgis <dimara@grnet.gr>
-Constantinos Venetsanopoulos <cven@grnet.gr>
-Vangelis Koukis <vkoukis@grnet.gr>
-Giorgos Verigakis <verigak@grnet.gr>
-Christos Stavrakakis <cstavr@grnet.gr>
-Chrysostomos Nanakos <cnanakos@grnet.gr>
+Nikos Skalkotos
+Dimitris Aragiorgis
+Constantinos Venetsanopoulos
+Vangelis Koukis
+Giorgos Verigakis
+Christos Stavrakakis
+Chrysostomos Nanakos
+Brian Candler