bug fix: no artifacts in tracker
Merge remote-tracking branch 'stable/master' into 3539_initiate_product_backlog

Conflicts:
	plugins/agiledashboard/include/AgileDashboard/Milestone/Backlog/DescendantBacklogStrategy.class.php
	plugins/agiledashboard/include/AgileDashboard/Milestone/Pane/ContentPresenterBuilder.class.php
THIS IS WHERE restriction was commented out for new plannings
Revert "THIS IS WHERE restriction was commented out for new plannings"

This reverts commit b572ecaa1726e4f130e75e20e43add4f7b988f79.
fixing bug of "no more open epics" not displayed in the right context

task #3605
adding new route and controller action
no change- odd merge
creating url for top planning
adding default pain to topcontent link
creating Planning_TopMilestone
adding plugins/agiledashboard/include/AgileDashboard/Milestone/Pane/TopContent/PresenterBuilder.class.php
adding new pane and associated classes
adding default value to new parameter
displaying topcontent pane
adding ustaches for top content
generating planning for top milestone
fixing tests
displaying backlog tracker name
adding method to get top backlog artifacts
fetching the correct artifacts for a Planning_TopMilestone