- updated link to repo in readme

- image loader will report last SDL error if loading failed
- fixed parsing of floats from H3 txt's

client/CBitmapHandler.cpp

@@ -151,6 +151,7 @@ SDL_Surface * BitmapHandler::loadBitmapFromDir(std::string path, std::string fna
 		else
 		{
             logGlobal->errorStream()<<"Failed to open "<<fname<<" via SDL_Image";
+			logGlobal->errorStream()<<"Reason: " << IMG_GetError();
 		}
 	}