made Abstract* specifications abstract
updated maven-publish-ext so that excluded dependencies are excluded in published maven pom
fixed bug where multiple exclusions would get collapsed or ignored
Merge pull request #28 from mlueders/declare_abstract_classes

made Abstract* specifications abstract
Merge pull request #29 from mlueders/fix_maven_publish_transitive_excludes

updated maven-publish-ext so that excluded dependencies are excluded in ...
[Gradle Release Plugin] - pre tag commit:  '0.13'.
[Gradle Release Plugin] - new version commit:  '0.14-SNAPSHOT'.