Latest release.

Changes in this release:

• Added connect with default database.
• Added rows effected, last insert id.
• Stability and speed improvements.
• Removed infinite wait in read_packet() if connection dropped.
  Merged wait_for_client() and wait_for_data() into one
  universal wait_for_bytes(int).
• Improved connect() speed.
• Improved sending queries speed.
  Sending the whole buffer at a time (not byte by byte).
• Fixed bug with check_ok_packet() return value.
  check_ok_packet() simplified to get_packet_type().
• Added checks for buffer validity in places it is going to be used.
  Improved stability on "incorrect" methods calls.
• Restored WITH_SELECT, but defined by default.
• Added DEBUG define to avoid prints to Serial port.
  Useful when Serial is used to communicate with sensors.
• Added example for ESP8266.