Add missing 1.9.3-jruby fixture files.
Changelog for 5529b39d4375c592cefe4ec909a33d8c8178e797.
Document the order in which configuration options are loaded

Configuration options are loaded from files, this docstring clarifies
which order they are loaded in and where they are loaded from (hopefully!)

Closes #739
Restore a public API I unintentionally broke in 39857f30ebc8f19374ece61e3c59cd12b5986f7d.

@DouweM rightly pointed out that I broke this API.

https://github.com/rspec/rspec-core/commit/39857f30ebc8f19374ece61e3c59cd12b5986f7d#commitcomment-2236278
Words.
2.12.1 release.
documentation for Formatters::Helpers
fixes #673
documentation for Formatters::SnippetExtractor

fixes #673
add feature to document failure_exit_code option
add feature to document profile_examples option
add feature to document run_all_when_everything_filtered
add feature to document pattern option
add feature to document treat_symbols_as_metadata_keys_with_true_values
use aruba exit code matcher
add feature to document drb and drb_port options
update documentation for Formatters::BaseFormatter

fixes #673
add feature to document show_failures_in_pending_blocks
documentation for Formatters::BaseTextFormatter with help from @wallace

fixes #673
add feature to document output_stream
Allows rbx to fail due to flaky compilation errors on Travis