Added tests.

Author: DanielRosenwasser

tests/cases/conformance/es6/templates/templateStringWithBackslashEscapes01.ts

@@ -0,0 +1,6 @@
+
+
+var a = `hello\world`;
+var b = `hello\\world`;
+var c = `hello\\\world`;
+var d = `hello\\\\world`;

tests/cases/conformance/es6/templates/templateStringWithBackslashEscapes01_ES6.ts

@@ -0,0 +1,6 @@
+// @target: es6
+
+var a = `hello\world`;
+var b = `hello\\world`;
+var c = `hello\\\world`;
+var d = `hello\\\\world`;