Pre commit to work on another issue
Merge branch 'issue#75-layout' into issue#84-lend_return_edit

Conflicts:
	src/main/java/de/dhbw/humbuch/view/ReturnView.java
Added a tree table and put the design up for discussion
Added save button and put it up for discussion
Refactored the lending and return screen completly.
Merge branch 'upstream/develop' into issue#84-lend_return_repair

Conflicts:
	src/main/java/de/dhbw/humbuch/view/LendingView.java
	src/main/java/de/dhbw/humbuch/view/MainUI.java
	src/main/java/de/dhbw/humbuch/view/ReturnView.java
Merge pull request #135 from henningmu/issue#84-lend_return_repair

Issue#84 lend return repair