Log Message:
Update ruby-rspec-core to 3.4.1.

### 3.4.1 / 2015-11-18
[Full Changelog](http://github.com/rspec/rspec-core/compare/v3.4.0...v3.4.1)

Bug Fixes:

* Fix backtrace formatter to handle backtraces that are `nil`.
  (Myron Marston, #2118)

### 3.4.0 / 2015-11-11
[Full Changelog](http://github.com/rspec/rspec-core/compare/v3.3.2...v3.4.0)

Enhancements:

* Combine multiple `--pattern` arguments making them equivalent to
  `--pattern=1,2,...,n`. (Jon Rowe, #2002)
* Improve `inspect` and `to_s` output for `RSpec::Core::Example`
  objects, replacing Ruby's excessively verbose output. (Gavin Miller, #1922)
* Add `silence_filter_announcements` configuration option.
  (David Raffensperger, #2007)
* Add optional `example_finished` notification to the reporter protocol for
  when you don't care about the example outcome. (Jon Rowe, #2013)
* Switch `--bisect` to a recursion-based bisection algorithm rather than
  a permutation-based one. This better handles cases where an example
  depends upon multiple other examples instead of just one and minimizes
  the number of runs necessary to determine that an example set cannot be
  minimized further. (Simon Coffey, #1997)
* Allow simple filters (e.g. `:symbol` key only) to be triggered by truthey
  values. (Tim Mertens, #2035)
* Remove unneeded warning about need for `ansicon` on Windows when using
  RSpec's `--color` option. (Ashley Engelund, #2038)
* Add option to configure RSpec to raise errors when issuing warnings.
  (Jon Rowe, #2052)
* Append the root `cause` of a failure or error to the printed failure
  output when a `cause` is available. (Adam Magan)
* Stop rescuing `NoMemoryError`, `SignalExcepetion`, `Interrupt` and
  `SystemExit`. It is dangerous to interfere with these. (Myron Marston, #2063)
* Add `config.project_source_dirs` setting which RSpec uses to determine
  if a backtrace line comes from your project source or from some
  external library. It defaults to `spec`, `lib` and `app` but can be
  configured differently. (Myron Marston, #2088)
* Improve failure line detection so that it looks for the failure line
  in any project source directory instead of just in the spec file.
  In addition, if no backtrace lines can be found from a project source
  file, we fall back to displaying the source of the first backtrace
  line. This should virtually eliminate the "Unable to find matching
  line from backtrace" messages. (Myron Marston, #2088)
* Add support for `:extra_failure_lines` example metadata that will
  be appended to the failure output. (bootstraponline, #2092).
* Add `RSpec::Core::Example#duplicate_with` to produce new examples
  with cloned metadata. (bootstraponline, #2098)
* Add `RSpec::Core::Configuration#on_example_group_definition` to register
  hooks to be invoked when example groups are created. (bootstraponline, #2094)
* Add `add_example` and `remove_example` to `RSpec::Core::ExampleGroup` to
  allow  manipulating an example groups examples. (bootstraponline, #2095)
* Display multiline failure source lines in failure output when Ripper is
  available (MRI >= 1.9.2, and JRuby >= 1.7.5 && < 9.0.0.0.rc1).
  (Yuji Nakayama, #2083)
* Add `max_displayed_failure_line_count` configuration option
  (defaults to 10). (Yuji Nakayama, #2083)
* Enhance `fail_fast` option so it can take a number (e.g. `--fail-fast=3`)
  to force the run to abort after the specified number of failures.
  (Jack Scotti, #2065)
* Syntax highlight the failure snippets in text formatters when `color`
  is enabled and the `coderay` gem is installed on a POSIX system.
  (Myron Marston, #2109)

Bug Fixes:

* Lock `example_status_persistence_file` when reading from and writing
  to it to prevent race conditions when multiple processes try to use
  it. (Ben Woosley, #2029)
* Fix regression in 3.3 that caused spec file names with square brackets in
  them (such as `1[]_spec.rb`) to not be loaded properly. (Myron Marston, #2041)
* Fix output encoding issue caused by ASCII literal on 1.9.3 (Jon Rowe, #2072)
* Fix requires in `rspec/core/rake_task.rb` to avoid double requires
  seen by some users. (Myron Marston, #2101)