Since you are usng WLC 7.5.102.0 firmware here is most upto date deployment guide for this feature. Hope it is useful.
http://www.cisco.com/en/US/docs/wireless/technology/bonjour/7.5/Bonjour_Gateway_Phase-2_WLC_software_release_7.5.html
Regarding the last comment, Apple introduced this for home/consumer environment where you will work with single vlan (or unmanaged home grade switch) using link local multicast feature (mDNS). Since then users demanding to bring those sort of thing into enterprise environment (consist of multiple l3, restrictive, etc) and all wireless vendors try to support it & it is not straight forward as of home environment. That's why even Cisco improving this feature satring from 7.3, 7.4 & 7.5 codes, still may not perfect how you want it.
HTH
Rasika
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