closes chieffancypants#184: change border radius to 50%

Author: chieffancypants

src/loading-bar.css

@@ -73,7 +73,7 @@
   border:  solid 2px transparent;
   border-top-color:  #29d;
   border-left-color: #29d;
-  border-radius: 10px;
+  border-radius: 50%;
 
   -webkit-animation: loading-bar-spinner 400ms linear infinite;
   -moz-animation:    loading-bar-spinner 400ms linear infinite;