Added Header, Footer and NavBar Components.
Added the first abstract basic screen and example how to use it
Added pupil and class list component.
First version of my screens
Fixed buttons alignment
Added margin and spacing
Merge remote-tracking branch 'origin/develop' into develop
Added 2 screens and a task component
Redefined the design of the core components
Redesigned the login screen. Not yet completed!
Merge branch 'develop' into upstream/develop

Conflicts:
	.gitignore
	src/main/java/de/dhbw/humbuch/BasicUI.java
Merge branch 'developNew' into upstream/develop
Now running (hopefully)
not ready yet, only commiting to be able to develop on another computer
Navigation is working, you can now design your screens. BindState also
seems to work, BindAction does not work, yet. Have to consult Herrmann.
Use HomeScreen/ManageBooksScreen as a template to design the new
screens.
Added home, login and dunning screen and a search bar.
Code is not yet refactored or perfectly styled.
Added first version of a multi-class-loader and edited NavigationBar
Merge branch 'develop' of https://github.com/HumBuch/HumBuch.git into
upstream/develop

Conflicts:
	.gitignore
Merge branch 'developNew' into upstream/develop

Conflicts:
	src/main/java/de/dhbw/humbuch/guice/BasicModule.java
	src/main/java/de/dhbw/humbuch/viewmodel/LoginViewModel.java
Merge branch 'develop' of https://github.com/HumBuch/HumBuch.git into upstream/develop
Merge remote-tracking branch 'upstream/develop' into upstream/develop