Feature/#103 navigate back (#107)

* #103 Added NAVIGATE_BACK function

* Commented out debugging test

* Updated implementation

pkg/compiler/compiler_test.go

@@ -2104,22 +2104,19 @@ func TestParam(t *testing.T) {
 //		c := compiler.New()
 //
 //		out, err := c.MustCompile(`
-//LET google = DOCUMENT("https://www.google.com/", true)
+//LET origin = "https://github.com/"
+//LET doc = DOCUMENT(origin, true)
 //
-//INPUT(google, 'input[name="q"]', "ferret", 25)
-//CLICK(google, 'input[name="btnK"]')
+//NAVIGATE(doc, "https://github.com/features")
 //
-//WAIT_NAVIGATION(google)
-//WAIT_ELEMENT(google, '.g', 5000)
+//LOG("NAVIGATE", doc.url)
+//
+//NAVIGATE_BACK(doc)
+//
+//LOG("NAVIGATE_BACK", doc.url)
+//
+//RETURN doc.url == origin
 //
-//FOR result IN ELEMENTS(google, '.g')
-//    // filter out extra elements like videos and 'People also ask'
-//    FILTER TRIM(result.attributes.class) == 'g'
-//    RETURN {
-//        title: INNER_TEXT(result, 'h3'),
-//        description: INNER_TEXT(result, '.st'),
-//        url: INNER_TEXT(result, 'cite')
-//    }
 //			`).Run(context.Background())
 //
 //		So(err, ShouldBeNil)