Proper spacing between offsets

row-fluids don't have the same negative margin-left as rows. This was
throwing everything off.
So added a different rule for first-child and subsequent "spans".

less/mixins.less

@@ -597,13 +597,19 @@
     .spanX (0) {}
 
     .offsetX (@index) when (@index > 0) {
-      (~'.offset@{index}, .row-fluid .offset@{index}:first-child') { .offset(@index); }
+      (~'.offset@{index}') { .offset(@index); }
+      (~'.offset@{index}:first-child') { .offsetFirstChild(@index); }
       .offsetX(@index - 1);
     }
     .offsetX (0) {}
 
     .offset (@columns) {
-      margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) + @fluidGridGutterWidth;
+      margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) + (@fluidGridGutterWidth*2);
+	  *margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) - (.5 / @gridRowWidth * 100 * 1%) + (@fluidGridGutterWidth*2) - (.5 / @gridRowWidth * 100 * 1%);
+    }
+    
+    .offsetFirstChild (@columns) {
+      margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) + (@fluidGridGutterWidth);
       *margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) - (.5 / @gridRowWidth * 100 * 1%) + @fluidGridGutterWidth - (.5 / @gridRowWidth * 100 * 1%);
     }