[Echo Item] recalculate item age every time in the renderer function + fixed bug in the "authorName" renderer with a text appending behaviour
[Echo Tests lib] update functionality that check a rendering mechanism to test rendered elements after recursively rerender view
[Echo Tests lib] update "onRerender" event contract of the submit control
[Echo.Canvas][Tests] empty ready function
[Tests Suite] CR fixes:
 - a bit more correct message for test assertion;
 - avoid code duplication.
Merge branch 'neurostep/f1176-item_timestamp_issue'