Fix CSS lint warnings

.csslintrc

@@ -5,11 +5,13 @@
     "bulletproof-font-face": false,
     "compatible-vendor-prefixes": false,
     "duplicate-properties": 2,
+    "fallback-colors": false,
     "font-faces": false,
     "font-sizes": false,
     "ids": false,
     "important": false,
     "outline-none": false,
+    "qualified-headings": false,
     "regex-selectors": false,
     "unique-headings": false,
     "universal-selector": false,

public/scss/_spinner.scss

@@ -38,6 +38,8 @@
 button.spinner {
   position: relative;
   text-indent: -999em;
+  direction: ltr;
+
   &:after {
     @include hidpi-background-image('spinnerwhite', 30px 30px);
     content: '';