Javadoc comments; Refactoring; Added some tests

...in/java/kieker/webgui/service/impl/util/package-info.java

...GUI/src/main/java/kieker/webgui/service/package-info.java

...ava/kieker/webgui/web/beans/application/ProjectsBean.java

...eker/webgui/web/beans/view/CurrentAnalysisEditorBean.java

...webgui/web/beans/view/CurrentAnalysisEditorGraphBean.java

...java/kieker/webgui/web/beans/view/CurrentCockpitBean.java

...ieker/webgui/web/beans/view/CurrentCockpitEditorBean.java

...c/main/java/kieker/webgui/web/converter/package-info.java

...ava/kieker/webgui/common/ClassAndMethodContainerTest.java

...a/kieker/webgui/common/EnvironmentLoaderListenerTest.java

...kieker/webgui/persistence/impl/util/PluginFinderTest.java

.../kieker/webgui/web/converter/RoleStringConverterTest.java