Fixed a few bugs in CPArray and added many new tests for CPArray.

Reviewed by me.

Tests/Foundation/_CPJavaScriptArrayTest.j

@@ -0,0 +1,16 @@
+
+@import <Foundation/Foundation.j>
+
+@import "CPArrayTest.j"
+
+
+@implementation _CPJavaScriptArrayTest : CPArrayTest
+{
+}
+
++ (Class)arrayClass
+{
+    return _CPJavaScriptArray;
+}
+
+@end