added basic network graph to articles

vipra-cmd/src/main/java/de/vipra/cmd/Main.java

...d/src/main/java/de/vipra/cmd/file/FilebaseVocabulary.java

...-cmd/src/main/java/de/vipra/cmd/option/ImportCommand.java

...md/src/main/java/de/vipra/cmd/option/ModelingCommand.java

...a-cmd/src/main/java/de/vipra/cmd/option/StatsCommand.java

vipra-cmd/src/main/resources/config.properties

vipra-ui/app/html/articles/detail/network.html

vipra-ui/app/html/articles/detail/show.html

vipra-ui/app/html/articles/index.html

vipra-ui/app/html/index.html

vipra-ui/app/js/app.js

vipra-ui/app/js/controllers.js

vipra-ui/app/js/directives.js

vipra-ui/app/js/factories.js

vipra-ui/app/js/filters.js

vipra-ui/app/js/helpers.js

vipra-ui/app/js/services.js

vipra-ui/app/less/app.less

vipra-ui/bower.json

vipra-ui/gulpfile.js