Fixed traincascade read issue

apps/traincascade/imagestorage.cpp

@@ -36,6 +36,7 @@ bool CvCascadeImageReader::NegReader::create( const string _filename, Size _winS
     while( !file.eof() )
     {
         std::getline(file, str);
+        str.erase(str.find_last_not_of(" \n\r\t")+1);
         if (str.empty()) break;
         if (str.at(0) == '#' ) continue; /* comment */
         imgFilenames.push_back(str);