add Get() to array.go, with tests

array.go

@@ -1,5 +1,9 @@
 package goquery
 
+import (
+	"exp/html"
+)
+
 // First() reduces the set of matched elements to the first in the set.
 // It returns a new Selection object.
 func (this *Selection) First() *Selection {
@@ -16,10 +20,8 @@ func (this *Selection) Last() *Selection {
 // If a negative index is given, it counts backwards starting at the end of the set.
 // It returns a new Selection object, and an empty Selection object if the index is invalid.
 func (this *Selection) Eq(index int) *Selection {
-	var l = len(this.Nodes)
-
 	if index < 0 {
-		index += l
+		index += len(this.Nodes)
 	}
 	return this.Slice(index, index+1)
 }
@@ -29,3 +31,13 @@ func (this *Selection) Eq(index int) *Selection {
 func (this *Selection) Slice(start int, end int) *Selection {
 	return pushStack(this, this.Nodes[start:end])
 }
+
+// Get() retrieves the underlying node at the specified index.
+// Get() without parameter is not implemented, since the node array is available
+// on the Selection object.
+func (this *Selection) Get(index int) *html.Node {
+	if index < 0 {
+		index += len(this.Nodes) // Negative index gets from the end
+	}
+	return this.Nodes[index]
+}