Merge branch 'r1.5'

* r1.5:
  post-release bump
  1.5.4 Release
  post-release bump
  1.5.3 Release
  post-release bump
  Release 1.5.2
  CDRIVER-1982 fix ifdef for strerror_s with mingw
  post-release bump
  1.5.1 Release
  post-release bump
  1.5.0 Release
  CDRIVER-1044 Fix unknown-pragmas warning on clang3.4
  CDRIVER-1910 Fedora installation instructions
  post-release bump
  1.5.0-rc6 Release
  update NEWS
  CDRIVER-1923 libbson installs manpages without bson_ prefix
  CDRIVER-1377 use INT64_MAX, not LLONG_MAX, in bson_stroll