html-markup for a timeline is now built in the challenge-engine. Also removed not used methods.
added designated css-class for every ActionButton-type
fixed JS-problem by removing all newlines from the html timlineEntry
<timeline_entry_markup> Merge branch 'unstable' into timeline_entry_markup

Conflicts:
	DralloApp/IOs/Drallo.Touch/DralloTouch.csproj
	DralloApp/IOs/Drallo.Touch/Screens/DralloDetailsScreen/Tabs/TimeLine/UIDralloTimelineView.cs
<timeline_entry_markup> remove unused code
<unstable> Merge branch 'timeline_entry_markup' into unstable