Install Zendesk package from PyPI

requirements/edx/base.txt

@@ -154,6 +154,7 @@ selenium==2.42.1
 splinter==0.5.4
 testtools==0.9.34
 testfixtures==4.5.0
+zendesk==1.1.1
 
 # Used for Segment analytics
 analytics-python==1.1.0

requirements/edx/github.txt

@@ -52,7 +52,6 @@ git+https://github.com/edx/django-openid-auth.git@0.8#egg=django-openid-auth==0.
 git+https://github.com/edx/MongoDBProxy.git@25b99097615bda06bd7cdfe5669ed80dc2a7fed0#egg=MongoDBProxy==0.1.0
 git+https://github.com/edx/nltk.git@2.0.6#egg=nltk==2.0.6
 -e git+https://github.com/dementrock/pystache_custom.git@776973740bdaad83a3b029f96e415a7d1e8bec2f#egg=pystache_custom-dev
--e git+https://github.com/eventbrite/zendesk.git@d53fe0e81b623f084e91776bcf6369f8b7b63879#egg=zendesk
 -e git+https://github.com/appliedsec/pygeoip.git@95e69341cebf5a6a9fbf7c4f5439d458898bdc3b#egg=pygeoip
 -e git+https://github.com/jazkarta/edx-jsme.git@c5bfa5d361d6685d8c643838fc0055c25f8b7999#egg=edx-jsme
 git+https://github.com/edx/django-pyfs.git@1.0.3#egg=django-pyfs==1.0.3