Use Java8 lambda expressions and enable basic table editing for sprint
data.
Initial commit to stage.
Wrapped the wrong UI test call in a Runnable to fix the error.
Added UI Test improvements to Backlog.
Reduced duplication in UI tests.
Merge branch 'master' of
https://github.com/FrankBeeh/ProductBacklogTimeline.git

Conflicts:
	ProductBacklog/src/main/de/frankbeeh/productbacklogtimeline/data/ProductTimeline.java
	ProductBacklog/src/main/de/frankbeeh/productbacklogtimeline/view/MainController.java
	ProductBacklog/src/test/de/frankbeeh/productbacklogtimeline/view/ImportProductBacklogUITest.java