MARMOTTA-486: Updated apache-parent-pom (14) and some plugins:
* maven-javadoc-plugin (2.9.1)
* maven-reactor-plugin (1.1)
* maven-surefire-plugin (2.17)
* maven-failsafe-plugin (2.17)
* maven-project-info-reports-plugin (2.7)
* maven-checkstyle-plugin (2.12.1)
* jrebel-maven-plugin (1.1.5)
* maven-dependency-plugin (2.8)
* apache-rat-plugin (0.10)
* maven-gpg-plugin (1.5)
* maven-bundle-plugin (2.4.0)
* maven-scr-plugin (1.16.0)
* build-helper-maven-plugin (1.8)
* yuicompressor-maven-plugin (1.1)
MARMOTTA-484: added some javadoc
MARMOTTA-484: some more javadoc
MARMOTTA-484: more doku and some convenience methods