Implemented curl support for web requests

include/AdblockPlus/WebRequest.h

 #ifndef ADBLOCKPLUS_WEB_REQUEST_H
 #define ADBLOCKPLUS_WEB_REQUEST_H
 
 #include <string>
 #include <vector>
 
+enum
+{
+  NS_OK = 0,
+  NS_ERROR_FAILURE = 0x80004005,
+  NS_ERROR_OUT_OF_MEMORY = 0x8007000e,
+  NS_ERROR_MALFORMED_URI = 0x804b000a,
+  NS_ERROR_CONNECTION_REFUSED = 0x804b000d,
+  NS_ERROR_NET_TIMEOUT = 0x804b000e,
+  NS_ERROR_NO_CONTENT = 0x804b0011,
+  NS_ERROR_UNKNOWN_PROTOCOL = 0x804b0012,
+  NS_ERROR_NET_RESET = 0x804b0014,
+  NS_ERROR_UNKNOWN_HOST = 0x804b001e,
+  NS_ERROR_REDIRECT_LOOP = 0x804b001f,
+  NS_ERROR_UNKNOWN_PROXY_HOST = 0x804b002a,
+  NS_ERROR_NOT_INITIALIZED = 0xc1f30001,
+  NS_CUSTOM_ERROR_BASE = 0x80850000
+};
+
 namespace AdblockPlus
 {
   typedef std::vector< std::pair<std::string, std::string> > HeadersList;
 
   struct ServerResponse
   {
+    unsigned int status;
     HeadersList responseHeaders;
     int responseStatus;
     std::string responseText;
   };
 
   class WebRequest
   {
   public:
     virtual ~WebRequest();
     virtual ServerResponse GET(const std::string& url, const HeadersList& requestHeaders) const = 0;
   };
+
+  class DefaultWebRequest : public WebRequest
+  {
+    ServerResponse GET(const std::string& url, const HeadersList& requestHeaders) const;
+  };
 }
 
 #endif