Attempted to change timeline range in runtime.
Changing timeline range in runtime.
Merge branch 'time_range'

Conflicts:
	timeline/ChronoGrapher/chronographer-addon/src/main/java/org/vaadin/chronographer/gwt/client/model/TimelineEvent.java
	timeline/ChronoGrapher/chronographer-demo/src/main/java/org/vaadin/chronographer/demo/SimpleTimelineExample.java