Add Boolean AND, OR operators (&, |)
Merge pull request #537 from yelled3/boolean_and_or_operators

Add Boolean AND, OR operators (&, |)
cleanup changelog for #537
Improve negated failure message of `output` matcher.

"expected block to not output to stderr, but did" is
not super helpful -- you'll want to know what was output.
Merge pull request #538 from rspec/better-output-failure-message

Improve negated failure message of `output` matcher.
Updated travis build scripts (from rspec-dev)
Merge pull request #540 from rspec/update-travis-build-scripts-2014-04-30-for-master

Updates from rspec-dev (2014-04-30)
Updated travis build scripts (from rspec-dev)
Merge pull request #542 from rspec/update-travis-build-scripts-2014-05-05-for-master

Updates from rspec-dev (2014-05-05)
fix typo
Merge pull request #545 from johnvoloski/master

Fix some typo
Updated travis build scripts (from rspec-dev)
Merge pull request #546 from rspec/update-travis-build-scripts-2014-05-09-for-master

Updates from rspec-dev (2014-05-09)
Stop supporting `require ‘rspec-expectations’`.

Use `require ‘rspec/expectations’` instead.
Merge pull request #548 from rspec/remove-root-file

Stop supporting `require ‘rspec-expectations’`.
Forwardport release notes from 2.99.0.rc1 [ci skip]
Prep changelog for 3.0.0.rc1 [ci skip]
Release 3.0.0.rc1
Updated travis build scripts (from rspec-dev)
Fix `output` docs.

[ci skip]