added maven-amps-plugin plugin to pom.xml to fix problem described here: https://answers.atlassian.com/questions/277302/a-required-class-is-missing-lorg-apache-maven-plugin-buildpluginmanager
fixed test class name typo (YaccServcieImplTest -> YaccServiceImplTest)
updated jira issue id regex in README.md. created standalone unit test to test jira issue id extraction from commit message. (see pull request #2)