Add initial browser test suite using phantomjs for headless testing and jasmine

test/less/css.less

@@ -36,7 +36,6 @@ div#id {
 
 @font-face {
   font-family: 'Garamond Pro';
-  src: url("/fonts/garamond-pro.ttf");
 }
 
 a:hover, a:link {
@@ -61,7 +60,6 @@ p + h1 {
   font: 100%/16px Arial;
   margin: 1px 0;
   padding: 0 auto;
-  background: url("http://www.lesscss.org/spec.html") no-repeat 0 4px;
 }
 
 #more-shorthands {
@@ -76,7 +74,6 @@ p + h1 {
   display: -moz-inline-stack;
   width: .1em;
   background-color: #009998;
-  background-image: url(images/image.jpg);
   background: -webkit-gradient(linear, left top, left bottom, from(red), to(blue));
   margin: ;
   .nested-multiple {
@@ -91,19 +88,6 @@ p + h1 {
   height: 20px ! important;
 }
 
-#data-uri {
-  background: url(data:image/png;charset=utf-8;base64,
-    kiVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAABlBMVEUAAAD/
-    k//+l2Z/dAAAAM0lEQVR4nGP4/5/h/1+G/58ZDrAz3D/McH8yw83NDDeNGe4U
-    kg9C9zwz3gVLMDA/A6P9/AFGGFyjOXZtQAAAAAElFTkSuQmCC);
-  background-image: url(data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==);
-  background-image: url(http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700);
-}
-
-#svg-data-uri {
-  background: transparent url('data:image/svg+xml, <svg version="1.1"><g></g></svg>');
-}
-
 .def-font(@name) {
     @font-face {
         font-family: @name