Merge branch 'maint'

* maint:
  INSTALL.md: Update information about MacOS X
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'

* maint:
  Fix descriptions of ssl_client_options and ssl_server_options
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'
Update primary bootstrap
Merge branch 'maint'

* maint:
  Fix wakeup functionality in no thread support case
Merge branch 'maint'
Merge remote branch 'upstream/maint'
Merge commit 'OTP_R15B01'
Merge branch 'maint'
Merge branch 'maint'