add minus icon

app/assets/stylesheets/svg-dimensions.css

@@ -26,6 +26,7 @@
 .icon-magnifier { width: 15px; height: 15px; }
 .icon-marker { width: 17px; height: 19px; }
 .icon-message { width: 24px; height: 24px; }
+.icon-minus { width: 20px; height: 20px; }
 .icon-mood-bad { width: 60px; height: 59px; }
 .icon-mood-good { width: 60px; height: 59px; }
 .icon-mood-ok { width: 60px; height: 59px; }

public/assets/images/icons/minus.svg

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg width="20px" height="20px" viewBox="0 0 20 20" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:sketch="http://www.bohemiancoding.com/sketch/ns">
+    <!-- Generator: Sketch 3.3.2 (12043) - http://www.bohemiancoding.com/sketch -->
+    <title>minus</title>
+    <desc>Created with Sketch.</desc>
+    <defs></defs>
+    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd" sketch:type="MSPage">
+        <g id="minus" sketch:type="MSArtboardGroup" fill="#50E3C2">
+            <path d="M2,8 L2,11 L19,11 L19,8 L2,8 Z" id="Shape" sketch:type="MSShapeGroup"></path>
+        </g>
+    </g>
+</svg>