Converted gen emitter tests to gtest, and removed the old testing framework from core

test/tests.cpp

@@ -1,18 +0,0 @@
-#include <fstream>
-#include <iostream>
-#include <sstream>
-#include <vector>
-
-#include "emittertests.h"
-#include "tests.h"
-
-namespace Test {
-void RunAll() {
-  bool passed = true;
-  if (!RunEmitterTests())
-    passed = false;
-
-  if (passed)
-    std::cout << "All tests passed!\n";
-}
-}