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/test_files/test_request.http

@@ -0,0 +1,13 @@
+GET /foo/bar?test=a&test2=b HTTP/1.1
+Host: example.org
+User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; fr; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8
+Accept: */*
+Accept-Language: fr,fr-fr;q=0.8,en-us;q=0.5,en;q=0.3
+Accept-Encoding: gzip,deflate
+Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
+Keep-Alive: 115
+Connection: keep-alive
+Content-Type: application/x-www-form-urlencoded
+X-Requested-With: XMLHttpRequest
+Referer: http://example.org/test
+Cookie: foo=bar; lorem=ipsum;