Function readFileToString

src/util/file.cc:198–203

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bool readFileToString(const std::string& file_name, std::string* output) {
  File* file = File::open(file_name, "r");
  if (file == NULL) return false;
  size_t size = file->size();
  return (size <= file->readToString(output, size*100));
}

bool writeStringToFile(const std::string& data, const std::string& file_name) {
  File* file = File::open(file_name, "w");