request parser rewrite + added tests

* rewrote request parser, now more simplified and theoretically faster
* added gtest and an example test to measure parser times

tests/speed_tests.cpp

@@ -0,0 +1,28 @@
+#include <gtest/gtest.h>
+#include <fstream>
+#include <chrono>
+#include "../lib/http/request.hpp"
+
+
+TEST(speed_tests, request_parse) {
+    using std::chrono::high_resolution_clock;
+    using std::chrono::duration_cast;
+    using std::chrono::duration;
+    using std::chrono::milliseconds;
+
+    std::ifstream t("./test_files/test_request.http");
+    std::stringstream buffer;
+    buffer << t.rdbuf();
+    std::string raw_req = buffer.str();
+
+    auto t1 = high_resolution_clock::now();
+    for(int i = 0; i < 1000000; ++i) {
+        volatile anthracite::http::request req (raw_req, "0.0.0.0");
+    }
+    auto t2 = high_resolution_clock::now();
+
+    /* Getting number of milliseconds as an integer. */
+    auto ms_int = duration_cast<milliseconds>(t2 - t1);
+
+    std::cout << "Parsed 1 Million requests in " << ms_int << "ms" << std::endl;
+}