Added test for "Specify type explicitly" for loop parameters.

#KT-1890 fixed

idea/testData/intentions/specifyType/afterLoopParameter.kt

@@ -0,0 +1,9 @@
+// "Specify Type Explicitly" "true"
+import java.util.HashMap
+import java.util.Map
+
+fun foo(map : HashMap<String, Int>) {
+    for (<caret>entry : Map.Entry<String, Int> in map.entrySet()) {
+
+    }
+}

idea/testData/intentions/specifyType/beforeLoopParameter.kt

@@ -0,0 +1,8 @@
+// "Specify Type Explicitly" "true"
+import java.util.HashMap
+
+fun foo(map : HashMap<String, Int>) {
+    for (<caret>entry in map.entrySet()) {
+
+    }
+}

idea/tests/org/jetbrains/jet/plugin/intentions/SpecifyTypeExplicitlyTest.java

@@ -49,6 +49,10 @@ public class SpecifyTypeExplicitlyTest extends LightIntentionActionTestCase {
         doTest();
     }
 
+    public void testLoopParameter() {
+        doTest();
+    }
+
     @Override
     protected String getTestDataPath() {
         return PluginTestCaseBase.getTestDataPathBase() + "/intentions/";