Merge pull request rubyburgers#14 from bruno-/master

Add rubyburgers Zagreb

Author: ys

_config.yml

@@ -11,3 +11,7 @@ cities:
     name: Lille, France
     latitude: 50.62925
     longitude: 3.057256
+- zagreb:
+    name: Zagreb, Croatia
+    latitude: 45.8150108
+    longitude: 15.981919

zagreb/burger_zagreb.jpg

@@ -0,0 +1,20 @@
+---
+layout: default
+title: RubyBurgers - Zagreb, Croatia
+---
+
+## Zagreb, Croatia
+
+![Burger Zagreb](/zagreb/burger_zagreb.jpg)
+
+### Info
+
+We gather weekly to enjoy burgers and ruby talks.
+
+Sharing knowledge is important to us so everyone gets to have a short ruby
+related demo.
+
+[Our meetup page](http://www.meetup.com/rubyzg/)
+
+Be sure to reach us on [twitter](https://twitter.com/rubyzagreb) because we also
+organize informal gatherings that aren't published as meetup events.