v0.8.64

Changes:
* Implemented retrying on all get REST APIs requests excepting
  job_result_format with IO, job_result_each and job_result_each_with_compr_size
  that lead to certain types of exception thrown: Errno::ECONNREFUSED,
  Errno::ECONNRESET, Timeout::Error, EOFError, OpenSSL::SSL::SSLError,
  SocketError and HTTP status code greater than 500 (Server errors).
* Implemented retrying on post REST APIs requests if the client options contain
  the 'retry_post_requests' option under the same circumstances as the get
  requests