Merge pull request #4202 from grafana/loading-pulse

Loading pulse

public/img/loading-pulse.svg

+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg width="25" height="25" viewBox="0 0 44 44" xmlns="http://www.w3.org/2000/svg" stroke="#f7941d" class="puff">
+    <g fill="none" fill-rule="evenodd" stroke-width="3"> 
+        <circle cx="22" cy="22" r="1">
+            <animate attributeName="r"
+                begin="0s" dur="3s"
+                values="1; 20"
+                calcMode="spline"
+                keyTimes="0; 1"
+                keySplines="0.165, 0.84, 0.44, 1"
+                repeatCount="indefinite" />
+            <animate attributeName="stroke-opacity"
+                begin="0s" dur="3s"
+                values="1; 0"
+                calcMode="spline"
+                keyTimes="0; 1"
+                keySplines="0.3, 0.61, 0.355, 1"
+                repeatCount="indefinite" />
+        </circle>
+        <circle cx="22" cy="22" r="1">
+            <animate attributeName="r"
+                begin="-1.5s" dur="3s"
+                values="1; 20"
+                calcMode="spline"
+                keyTimes="0; 1"
+                keySplines="0.165, 0.84, 0.44, 1"
+                repeatCount="indefinite" />
+            <animate attributeName="stroke-opacity"
+                begin="-1.5s" dur="3s"
+                values="1; 0"
+                calcMode="spline"
+                keyTimes="0; 1"
+                keySplines="0.3, 0.61, 0.355, 1"
+                repeatCount="indefinite" />
+        </circle>
+    </g>
+</svg>
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