merge dev onto master (#17)
merge dev onto master (#17)

* Update dev branch with master (#15)

* Added CI configuration for Travis

* Removed element-ui and fixed Unit Testing

* Adapted CI config to run special test command

* Removed last element-ui links

* Removed Card from main.js

* Added BEM CSS styles and changed sidebar component concept

* Added Navigation Component

* Use the correct slot element (#14)

* Add webhook to travis (#16)

* Added CI configuration for Travis

* Removed element-ui and fixed Unit Testing

* Adapted CI config to run special test command

* Removed last element-ui links

* Removed Card from main.js

* Added BEM CSS styles and changed sidebar component concept

* Added Navigation Component

* Use the correct slot element (#14)

* add webhook to travis

markd/markd,markd/markd