Revert "maint - Add temp workaround for travis ruby 1.8.7"

This reverts commit 34f10c9db724510ea584a6f44d989c60ae8ffe25.

The underlying issue was was fixed in gem 2.2.1.
Merge pull request #153 from richardc/travis_187_working

Revert "maint - Add temp workaround for travis ruby 1.8.7"
(MCO-158) MCollective service doesn't exit on Windows

This commit lets the Windows service kill any blocking threads when it
exits, allowing us to cleanly and quietly terminate.
Merge pull request #152 from ploubser/bug/master/mco-158

(MCO-158) MCollective service doesn't exit on Windows
maint - update changelog for MCO-158
(MCO-162) update releasenotes and changelog for 2.4.0-rc2
Merge pull request #154 from richardc/mco-162

(MCO-162) update releasenotes and changelog for 2.4.0-rc2
(MCO-168) Release 2.4.0

Release 2.4.0 final
Merge pull request #155 from ploubser/feature/master/mco-168

(MCO-168) Release 2.4.0
Add initial support for building in a RHEL 7 mock

Building in an x86_64 mock, since RHEL has not yet provided a 32-bit release.
Merge pull request #156 from mckern/add-el7-for-mocks

Add initial support for building in a RHEL 7 mock
MCO-172 - fix subscription logic for rabbitmq.use_reply_exchange mode

This commit explains the reasoning behind the original
`return if type == :reply` gates in `#subscribe` and `#unsubscribe` and
the exception needed to them for the `use_reply_exchange` option.
Merge pull request #158 from richardc/mco-172

MCO-172 - fix subscription logic for rabbitmq.use_reply_exchange mode
(MCO-173) Improve logging when using STOMP 1.1 features with a gem that only supports STOMP 1.0

In the past when a stomp protocol incompatibility error occurred during
runner startup the daemon would not start and no error message would be
logged. This would however always happen if a failure occurred during
initialization of the runner.

This commit adds an exception handler to runner#initialize that will
make sure that an error message is logged when it fails to start.
Merge pull request #159 from ploubser/improvement/master/mco-173

(MCO-173) Improve logging when using STOMP 1.1 features with a gem that ...