registration: nickname should not be disabled for guests
registration: nickname should not be disabled for guests

we now have a notion of a "half-registered" user, and we still need to collect a username from them after email confirmation

kwagdy/koding-1,jack89129/koding,andrewjcasal/koding,rjeczalik/koding,koding/koding,gokmen/koding,alex-ionochkin/koding,mertaytore/koding,mertaytore/koding,kwagdy/koding-1,usirin/koding,alex-ionochkin/koding,usirin/koding,alex-ionochkin/koding,jack89129/koding,acbodine/koding,acbodine/koding,szkl/koding,cihangir/koding,gokmen/koding,alex-ionochkin/koding,sinan/koding,rjeczalik/koding,drewsetski/koding,alex-ionochkin/koding,kwagdy/koding-1,acbodine/koding,drewsetski/koding,kwagdy/koding-1,kwagdy/koding-1,cihangir/koding,cihangir/koding,szkl/koding,usirin/koding,andrewjcasal/koding,alex-ionochkin/koding,koding/koding,sinan/koding,rjeczalik/koding,mertaytore/koding,koding/koding,cihangir/koding,drewsetski/koding,drewsetski/koding,andrewjcasal/koding,szkl/koding,gokmen/koding,andrewjcasal/koding,usirin/koding,usirin/koding,mertaytore/koding,alex-ionochkin/koding,szkl/koding,sinan/koding,usirin/koding,andrewjcasal/koding,andrewjcasal/koding,acbodine/koding,koding/koding,koding/koding,usirin/koding,rjeczalik/koding,koding/koding,jack89129/koding,acbodine/koding,kwagdy/koding-1,szkl/koding,kwagdy/koding-1,acbodine/koding,rjeczalik/koding,usirin/koding,koding/koding,koding/koding,gokmen/koding,jack89129/koding,gokmen/koding,drewsetski/koding,mertaytore/koding,jack89129/koding,acbodine/koding,gokmen/koding,jack89129/koding,drewsetski/koding,szkl/koding,jack89129/koding,andrewjcasal/koding,mertaytore/koding,cihangir/koding,andrewjcasal/koding,sinan/koding,rjeczalik/koding,jack89129/koding,sinan/koding,sinan/koding,mertaytore/koding,rjeczalik/koding,szkl/koding,kwagdy/koding-1,rjeczalik/koding,sinan/koding,cihangir/koding,drewsetski/koding,alex-ionochkin/koding,szkl/koding,drewsetski/koding,sinan/koding,acbodine/koding,gokmen/koding,gokmen/koding,mertaytore/koding,cihangir/koding,cihangir/koding