grouping (still in the works)
Merge branch 'tl-development' of https://github.com/STIXProject/stix-viz into tl-development
Added relationship labels to top down nodes
grouping, mostly done
Merged updates
Fixed endtime of groups(for groups of 2)
Added legend
Revert "Merged updates"

This reverts commit 3647dd937564fc930c2142c1b90d7162f5631b5c.
Add relationship labels to links
Use SVG font for link labels
Remove part of link label before colon
Fixed intergration with context nodes for timeline
Fixed css for links in tree view
Added drag to pin checkbox to graph view
Tweaking graph resize behavior. 
Visual indicator of pinned nodes.
Place link labels in center of link and rotate them 180 degrees if the
source is to the right of the target
code clean up
Merge remote-tracking branch 'origin/graph-view-dev' into tl-development
Added timeline back to the index
merged changes
Merge branch 'graph-view-dev' into tl-development

Conflicts:
	src/nodejs/public/css/treeLayout.css
	src/nodejs/public/js/STIXRelationshipGraph.js