Revert "Ticket #2796: don't allow arbitrary overriding of the 'action' class and other parameters pulled from the URL mapper."
Revert "Ticket #2796: don't allow arbitrary overriding of the 'action' class and other parameters pulled from the URL mapper."

This reverts commit 4193a826d3500c1c8771e2a55ca197011fe637c8.

xebia/statusnet-oauth2,minmb/statusnet,faulteh/gnu-social,foocorp/gnu-social,bankonme/gnu-social,zcopley/StatusNet,charlycoste/StatusNet,csarven/statusnet,bankonme/gnu-social,UngPirat/freesocial,zh/statusnet,xebia/statusnet-oauth2,chimo/social,zh/statusnet,charnimda/lgbtpzn-social,zcopley/StatusNet,shashi/StatusNet,sikevux/bsk-social,sikevux/bsk-social,charnimda/lgbtpzn-social,furtherfield/gnu-social,charlycoste/StatusNet,xebia/statusnet-oauth2,csarven/statusnet,studio666/gnu-social,bankonme/gnu-social,gnusocial/mainline,eXcomm/gnu-social,UngPirat/freesocial,d3vgru/StatusNet,eXcomm/gnu-social,chimo/social,faulteh/gnu-social,zcopley/StatusNet,chimo/social,minmb/statusnet,zcopley/zcopleys-statusnet-clone,Piratas/tortuga,studio666/gnu-social,sikevux/bsk-social,d3vgru/StatusNet,bankonme/gnu-social,gnusocial/mainline,csarven/statusnet,charlycoste/StatusNet,shashi/StatusNet,zcopley/zcopleys-statusnet-clone,UngPirat/freesocial,faulteh/gnu-social,zh/statusnet,csarven/statusnet,shashi/StatusNet,minmb/statusnet,d3vgru/StatusNet,furtherfield/gnu-social,foocorp/gnu-social,Piratas/tortuga,studio666/gnu-social,zcopley/zcopleys-statusnet-clone,Piratas/tortuga,eXcomm/gnu-social,gnusocial/mainline,faulteh/gnu-social,eXcomm/gnu-social,charnimda/lgbtpzn-social,gnusocial/mainline,foocorp/gnu-social,sikevux/bsk-social,furtherfield/gnu-social,furtherfield/gnu-social,studio666/gnu-social,Piratas/tortuga