1.15.3 — Lawrence of Arabia

Bug fix update.

• Fixed a bug that caused the endpoints of a reversed range to not be
  correctly included or excluded (#3449)
• Fixed the reverse_iterator implementation for leaf nodes (#3446)
• Fixed a bug that could cause a bad ordering of secondary indexes for
  rows with different primary key sizes (#3444)
• Fixed a bug that could cause a crash under high load when using
  changefeeds (#3393)
• Fixed a bug that made it impossible to chain between and
  distinct (#3346)
• Changed some calls to avoid passing NULL to memcpy (#3317)
• Fixed the installer artwork on OS X Yosemite (#3253)
• Changed the version scheme for the JavaScript driver to avoid
  mis-use of pre-release numbers (#3281)
• Fixed a bug that could cause rethinkdb import and rethinkdb export to hang (#3458)