fixed some npes, added loading screen and fade to loading topic models

vipra

vipra-cmd/src/main/java/de/vipra/cmd/lda/Analyzer.java

vipra-ui/app/html/index.html

vipra-ui/app/index.html

vipra-ui/app/js/app.js

vipra-ui/app/js/controllers.js

vipra-ui/app/less/app.less

vipra-ui/bower.json

vipra-ui/gulpfile.js

...a-util/src/main/java/de/vipra/util/model/ArticleFull.java

...-util/src/main/java/de/vipra/util/model/ArticleStats.java