✨ inline-svg helper for icons (#558)

no issue
- adds [ember-inline-svg](https://github.com/minutebase/ember-inline-svg) addon
- configure svg path to `public/assets/icons` so that icons can be accessed directly, eg `{{inline-svg "plane.svg"}}`
- configure svg optimization to remove title, dimensions, and xmlns element (not needed for inline svg)
- add existing icons as used on Ghost.org

ember-cli-build.js

@@ -133,6 +133,18 @@ module.exports = function (defaults) {
         },
         'ember-cli-selectize': {
             theme: false
+        },
+        svg: {
+            paths: [
+                'public/assets/icons'
+            ],
+            optimize: {
+                plugins: [
+                    {removeDimensions: true},
+                    {removeTitle: true},
+                    {removeXMLNS: true}
+                ]
+            }
         }
     });
 

package.json

@@ -69,6 +69,7 @@
     "ember-data-filter": "1.13.0",
     "ember-export-application-global": "1.1.1",
     "ember-infinity": "0.2.8",
+    "ember-inline-svg": "0.1.7",
     "ember-invoke-action": "1.4.0",
     "ember-light-table": "1.8.2",
     "ember-load": "0.0.11",