Removed editor-style style files in favor of adding a simple _tinymce.scss partial. This cuts styles compiling time in about half.

`add_editor_style` now just references `main.css`

assets/manifest.json

@@ -12,11 +12,6 @@
       ],
       "main": true
     },
-    "editor-style.css": {
-      "files": [
-        "styles/editor-style.scss"
-      ]
-    },
     "jquery.js": {
       "bower": ["jquery"]
     }