Fix loading and not found record display bug.

src/bootstrap-table.css

@@ -147,7 +147,7 @@
 .fixed-table-loading {
     display: none;
     position: absolute;
-    top: 38px;
+    top: 42px;
     right: 0;
     bottom: 0;
     left: 0;

src/bootstrap-table.js

@@ -327,7 +327,7 @@
         } else {
             this.$header.show();
             this.$container.find('.fixed-table-header').show();
-            this.$loading.css('top', '38px');
+            this.$loading.css('top', '42px');
         }
 
         this.$selectAll = this.$header.find('[name="btSelectAll"]');
@@ -979,7 +979,6 @@
 
         this.$header_ = this.$header.clone(true);
         this.$selectAll_ = this.$header_.find('[name="btSelectAll"]');
-        this.$el.css('margin-top', -this.$header.height());
 
         // fix bug: get $el.css('width') error sometime (height = 500)
         setTimeout(function () {
@@ -987,11 +986,12 @@
                 'height': '37px',
                 'border-bottom': '1px solid #dddddd',
                 'margin-right': scrollWidth
-            })
-                .find('table').css('width', that.$el.css('width'))
+            }).find('table').css('width', that.$el.css('width'))
                 .html('').attr('class', that.$el.attr('class'))
                 .append(that.$header_);
 
+            that.$el.css('margin-top', -that.$header.height());
+
             that.$body.find('tr:first-child:not(.no-records-found) > *').each(function(i) {
                 that.$header_.find('div.fht-cell').eq(i).width($(this).innerWidth());
             });