split files & created build file

src/Border.js

@@ -0,0 +1,18 @@
+/*
+ * Function to provide border details for an element
+ */
+
+html2canvas.prototype.getBorderData = function(el){
+     
+    var borders = [];
+    var _ = this;
+    this.each(["top","right","bottom","left"],function(i,borderSide){
+        borders.push({
+            width: parseInt(_.getCSS(el,'border-'+borderSide+'-width'),10),
+            color: _.getCSS(el,'border-'+borderSide+'-color')
+        });
+    });
+            
+    return borders;
+            
+}