change twitter username to allow uppercase letters and underscores
change twitter username to allow uppercase letters and underscores

darcs-hash:20080923060314-5ed1f-2ec4894251b99a2f9e9763ecc41659533bfab2eb.gz

bankonme/gnu-social,charnimda/lgbtpzn-social,csarven/statusnet,shashi/StatusNet,meitar/laconica,minmb/statusnet,xebia/statusnet-oauth2,furtherfield/gnu-social,eXcomm/gnu-social,bankonme/gnu-social,zcopley/zcopleys-statusnet-clone,UngPirat/freesocial,Piratas/tortuga,foocorp/gnu-social,xebia/statusnet-oauth2,znarf/statusnet-ladistribution,eXcomm/gnu-social,studio666/gnu-social,meitar/laconica,chimo/social,minmb/statusnet,csarven/statusnet,UngPirat/freesocial,Br3nda/laconica,charlycoste/StatusNet,furtherfield/gnu-social,brion/StatusNet,charnimda/lgbtpzn-social,furtherfield/gnu-social,zcopley/zcopleys-statusnet-clone,faulteh/gnu-social,minmb/statusnet,znarf/statusnet-ladistribution,d3vgru/StatusNet,d3vgru/StatusNet,Piratas/tortuga,faulteh/gnu-social,csarven/statusnet,brion/StatusNet,studio666/gnu-social,d3vgru/StatusNet,sikevux/bsk-social,Piratas/tortuga,znarf/statusnet-ladistribution,shashi/StatusNet,zcopley/StatusNet,xebia/statusnet-oauth2,foocorp/gnu-social,zcopley/StatusNet,meitar/laconica,brion/StatusNet,gnusocial/mainline,faulteh/gnu-social,bankonme/gnu-social,studio666/gnu-social,bankonme/gnu-social,gnusocial/mainline,zh/statusnet,furtherfield/gnu-social,zh/statusnet,eXcomm/gnu-social,Br3nda/laconica,gnusocial/mainline,chimo/social,gnusocial/mainline,charnimda/lgbtpzn-social,csarven/statusnet,faulteh/gnu-social,chimo/social,zcopley/zcopleys-statusnet-clone,charlycoste/StatusNet,sikevux/bsk-social,zh/statusnet,charlycoste/StatusNet,Piratas/tortuga,zcopley/StatusNet,UngPirat/freesocial,sikevux/bsk-social,eXcomm/gnu-social,Br3nda/laconica,foocorp/gnu-social,studio666/gnu-social,sikevux/bsk-social,shashi/StatusNet