Add support for validating signatures with the rsa-sha256 algorithm.
Add support for validating signatures with the rsa-sha256 algorithm.

git-svn-id: a243b28a2a52d65555a829a95c8c333076d39ae1@3064 44740490-163a-0410-bde0-09ae8108e29a

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