Merge pull request #47 from hajush/master

Switch ScriptContentTest to JenkinsRule - tests failing on mac from incorrect use of Assume
Fix JENKINS-15008

Make the message clear as to what is missing
Improved recipient email address resolution,- use address from Mailer.UserProperty for recipients provided without email domain
Merge pull request #48 from advantiss/master

Recepients email address resolution improvement
Add intitial debug mode
Update to latest LTS
Fix JENKINS-13848 and JENKINS-13672
Fix HTML emails and test fix for concurrent email issue
Implement ability to set Reply-To header
Added ability to truncate the failed test output
Add ability to override Reply-To at trigger and project levels
Merge branch 'JENKINS-5949'
Fixed Reply-To tests
Fix JENKINS-15213

Allow administrator to enable security for pre-send scripts. This is a
breaking change for current pre-send scripts.
Added use of the groovy sandbox
Added some comments
Implement security test
[maven-release-plugin] prepare release email-ext-2.25
[maven-release-plugin] prepare for next development iteration
Re-add ability to use tokens in attachment areas