Update maintainer email. Add chart icon

* Add .helmignore
* Add icon to chart directory

Author: Dean-Coakley

deployments/helm-chart/.helmignore

@@ -0,0 +1,2 @@
+# Patterns to ignore when building packages.
+*.png

deployments/helm-chart/Chart.yaml

@@ -2,14 +2,12 @@ name: nginx-ingress
 version: 0.2.0
 appVersion: 1.4.4
 description: NGINX Ingress Controller
+icon: https://raw.githubusercontent.com/nginxinc/kubernetes-ingress/v1.4.4/deployments/helm-chart/chart-icon.png
 sources:
   - https://github.com/nginxinc/kubernetes-ingress/tree/v1.4.4/deployments/helm-chart
 keywords:
   - ingress
   - nginx
 maintainers:
-  - name: Damian Curry
-    email: damian.curry@nginx.com
-  - name: Dean Coakley
-    email: dean.coakley@nginx.com
-
+  - name: NGINX Kubernetes Team
+    email: kubernetes@nginx.com