Added __contains__() for SimAbstractMemory.
Added __contains__() for SimAbstractMemory.

chubbymaggie/simuvex,f-prettyland/angr,chubbymaggie/angr,iamahuman/angr,zhuyue1314/simuvex,f-prettyland/angr,schieb/angr,iamahuman/angr,angr/angr,angr/simuvex,chubbymaggie/simuvex,tyb0807/angr,chubbymaggie/simuvex,axt/angr,chubbymaggie/angr,f-prettyland/angr,axt/angr,axt/angr,chubbymaggie/angr,angr/angr,schieb/angr,tyb0807/angr,angr/angr,schieb/angr,tyb0807/angr,iamahuman/angr