Merge pull request #322 from waynr/feature/install-dev-release-repos

(QENG-715) Add `install_dev_repo` to Beaker DSL
(GEM) create beaker 1.14.0 gem
Merge pull request #340 from anodelman/make-gem

(GEM) create beaker 1.14.0 gem
(MAINT) Fix multiple dev repo installation case.

Signed-off-by: Wayne <wayne@puppetlabs.com>