fixes #66
nothing
Merge branch 'PDP' into engine and error repair in Context().clearInterface

Conflicts:
	d3/TulipPosy.js
fixes #50 and #43
correction of small error
Merge branch 'engine' into PDP

Conflicts:
	d3/Client.js
	d3/Interaction.js
	d3/TulipPosy.js
	d3/View.js
	d3/css/style.css