Add Ponyville example event_link

Author: Tyler Mauthe

exampleSite/content/events/2017-ponyville/index.md

@@ -8,4 +8,10 @@ Pivot paradigm sticky note agile grok unicorn waterfall is so 2000 and late resp
 
 # This is our thing!
 
+Tickets
+: {{< event_link url-key="registration_link" text="Register here!" >}}
+
+Location
+: {{< event_link text-key="location_address" page="location" >}}
+
 <img src ="/events/2017-ponyville/want.gif">

exampleSite/data/events/2017-ponyville.yml

@@ -13,7 +13,7 @@ registration_date_start: 2017-05-15
 registration_date_end: 2017-05-30
 registration_open: ""
 registration_closed: ""
-registration_link: ""
+registration_link: "https://www.example.com"
 coordinates: "41.882219, -87.640530"
 location: "Applejack House"
 location_address: "350 West Mart Center Drive, Chicago, IL 60654"