SAML2: Fix generation of mdui:Logo element with ampersand in URL.
SAML2: Fix generation of mdui:Logo element with ampersand in URL.

Thanks to Dick Visser for reporting this bug!

git-svn-id: a243b28a2a52d65555a829a95c8c333076d39ae1@3241 44740490-163a-0410-bde0-09ae8108e29a

girgen/simplesamlphp,Kunstmaan/simplesamlphp,Kunstmaan/simplesamlphp,gtkrug/simplesamlphp,gtkrug/simplesamlphp,sylvainmed/simplesamlphp,dzuelke/simplesamlphp,girgen/simplesamlphp,dialogik/simplesamlphp,gtkrug/simplesamlphp,maytechnet/simplesamlphp,ghalse/simplesamlphp,grnet/simplesamlphp,shoaibali/simplesamlphp,Kunstmaan/simplesamlphp,dialogik/simplesamlphp,grnet/simplesamlphp,simplesamlphp/simplesamlphp,sitya/simplesamlphp,madmatt/simplesamlphp,StudentLifeMarketingAndDesign/simplesamlphp,BrettMerrick/simplesamlphp,dialogik/simplesamlphp,maytechnet/simplesamlphp,StudentLifeMarketingAndDesign/simplesamlphp,sylvainmed/simplesamlphp,jschlyter/simplesamlphp,shoaibali/simplesamlphp,gtkrug/simplesamlphp,simplesamlphp/simplesamlphp,dnmvisser/simplesamlphp,dzuelke/simplesamlphp,BrettMerrick/simplesamlphp,BrettMerrick/simplesamlphp,jschlyter/simplesamlphp,ghalse/simplesamlphp,simplesamlphp/simplesamlphp,ghalse/simplesamlphp,dnmvisser/simplesamlphp,maytechnet/simplesamlphp,cwaldbieser/simplesamlphp,sitya/simplesamlphp,girgen/simplesamlphp,BrettMerrick/simplesamlphp,shoaibali/simplesamlphp,cwaldbieser/simplesamlphp,sitya/simplesamlphp,cwaldbieser/simplesamlphp,jschlyter/simplesamlphp,sylvainmed/simplesamlphp,Kunstmaan/simplesamlphp,madmatt/simplesamlphp,jschlyter/simplesamlphp,grnet/simplesamlphp,dnmvisser/simplesamlphp,StudentLifeMarketingAndDesign/simplesamlphp,simplesamlphp/simplesamlphp,cwaldbieser/simplesamlphp,StudentLifeMarketingAndDesign/simplesamlphp,jschlyter/simplesamlphp,grnet/simplesamlphp,dialogik/simplesamlphp,sylvainmed/simplesamlphp,dnmvisser/simplesamlphp,shoaibali/simplesamlphp,ghalse/simplesamlphp,dialogik/simplesamlphp,girgen/simplesamlphp,sitya/simplesamlphp,dzuelke/simplesamlphp,madmatt/simplesamlphp,maytechnet/simplesamlphp,madmatt/simplesamlphp,dzuelke/simplesamlphp,girgen/simplesamlphp