Refactor JS tests: unified package name, test JS specific map implementations only in JS.

Add required files to build StdLibTestToJSTest.
Remove tests StdLibMapJsTest and StdLibSetJsTest because they are tested elsewhere.

libraries/stdlib/test/js/JsArrayTest.kt

@@ -1,4 +1,4 @@
-package jstest
+package test.collections
 
 import org.junit.Test as test
 import kotlin.test.*
@@ -7,9 +7,9 @@ import java.util.ArrayList;
 class JsArrayTest {
 
     test fun arraySizeAndToList() {
-        val a1 = array<String>()
-        val a2 = array("foo")
-        val a3 = array("foo", "bar")
+        val a1 = arrayOf<String>()
+        val a2 = arrayOf("foo")
+        val a3 = arrayOf("foo", "bar")
 
         assertEquals(0, a1.size())
         assertEquals(1, a2.size())
@@ -22,7 +22,7 @@ class JsArrayTest {
     }
 
     test fun arrayListFromCollection() {
-        var c: Collection<String>  = array("A", "B", "C").toList()
+        var c: Collection<String>  = arrayOf("A", "B", "C").toList()
         var a = ArrayList(c)
 
         assertEquals(3, a.size())