Cannot root phone by installing superuser.zip CWM v6.0.5.1 Stable
You did succesfully installed the superuser framework but you need to install SuperSu what controls everything. Follow steps below to successfully install SuperSu:

Download SuperSu from the play store here.
Open SuperSu and you should see something like this:


Screenshot - Update SU binary (Click to enlarge)

Click continue.
Click normal. (If you see message for more then 5 minutes then reboot and try the other option)
Reboot your phone and now you should be rooted. Check it with a root checker app like this:


ScreenShot - Root check, Success (Click to enlarge)

Consider purchasing the pro version to support the developer here.

Hope my answer helps.