go: added some enhancements for credentials api
go: added some enhancements for credentials api

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