Adds support to SecRemoteRules and Include directives

This commit includes a refactoring on important pieces of the parser
to allow it work in a stack fashion. Driver and Rules classes were
simplified and the RulesProperties class was created.

test/test-cases/regression/config-secremoterules.json

@@ -0,0 +1,44 @@
+[
+  {
+    "enabled":1,
+    "version_min":300000,
+    "title":"Include",
+    "client":{
+      "ip":"200.249.12.31",
+      "port":123
+    },
+    "server":{
+      "ip":"200.249.12.31",
+      "port":80
+    },
+    "request":{
+      "headers":{
+        "Host":"localhost",
+        "User-Agent":"curl/7.38.0",
+        "Accept":"*/*"
+      },
+      "uri":"/?key=value&key=other_value",
+      "protocol":"GET"
+    },
+    "response":{
+      "headers":{
+        "Date":"Mon, 13 Jul 2015 20:02:41 GMT",
+        "Last-Modified":"Sun, 26 Oct 2014 22:33:37 GMT",
+        "Content-Type":"text/html"
+      },
+      "body":[
+        "no need."
+      ]
+    },
+    "expected":{
+      "debug_log":"Executing operator \"@pmfromfile \" with param \"https://www.modsecurity.org/modsecurity-regression-test.txt\" against REQUEST_FILENAME"
+    },
+    "rules":[
+      "SecRuleEngine On",
+      "SecDebugLog \/tmp\/modsec_debug.log",
+      "SecDebugLogLevel 9",
+      "SecRemoteRules key https://www.modsecurity.org/modsecurity-regression-test-secremoterules.txt",
+      "SecRule ARGS \"@contains somethingelse\" \"id:9,pass,t:trim\""
+    ]
+  }
+]