adding container for children tab
adding emberjs lib
using newer version of jQuery
adding table for artifactchildren and basic js file for corresponding code
begiining of ajax fetch children
Merge branch 'lostSheep' into 1693_see_all_children_and_grandchildren_of_an_artifact

Conflicts:
	plugins/tracker/include/Tracker/Artifact/Tracker_Artifact.class.php
	plugins/tracker/include/trackerPlugin.class.php
introduce tabs in artifact view
user can bookmark and switch tabs
add js unit test
insert all children given by the server
insert child in a table
display the status
display the xref
display the xref as link
tests run in browser and in console
Move table generation to the js client

+ json gives the url of the artifact
+ display header of the table
Loads the artifactChildren on the artifact page
consistent look and feel with cross tracker search
display that there is no children
ff compatible test