add default initializer to let variables within loop bodies and fix excessive break replacement inside of switches in let scoping - fixes #255

test/fixtures/transformation/es6-let-scoping/loop-initializer-default/actual.js

@@ -0,0 +1,11 @@
+while (value) {
+  let foo;
+
+  if (bar) {
+    foo = [];
+  }
+
+  if (foo) {
+    doIt();
+  }
+}

test/fixtures/transformation/es6-let-scoping/loop-initializer-default/expected.js

@@ -0,0 +1,13 @@
+"use strict";
+
+while (value) {
+  var foo = undefined;
+
+  if (bar) {
+    foo = [];
+  }
+
+  if (foo) {
+    doIt();
+  }
+}