fixed search result count, updated explorer css, added slides to frontpage

...rc/main/java/de/vipra/rest/resource/SequenceResource.java

.../main/java/de/vipra/rest/resource/TopicModelResource.java

...d/src/main/java/de/vipra/rest/resource/TopicResource.java

.../src/main/java/de/vipra/rest/resource/WindowResource.java

vipra-ui/app/html/explorer.html

vipra-ui/app/html/index.html

vipra-ui/app/html/slides.html

vipra-ui/app/img/vipra-screencast.png

vipra-ui/app/img/vipra-slides.png

vipra-ui/app/js/app.js

vipra-ui/app/js/controllers.js

vipra-ui/app/less/app.less