Bad call to getHiddenDurationBetween

Bug in Range.js call to DateUtil.getHiddenDurationBetween. It was passing in this.options.moment which is not expected by getHiddenDurationBetween.

add styles option back for data points

Added possibility to change (or hide) the title of a CustomTime element.

It was implemented in commit 4e6c5a5 and accidentally deleted in commit
f39c246.

Node labels don't currently make use of the 'align' property, so this reuses
the existing property.

The label code has a number of alignment options that make sense to edges only,
so the Edge/Node now passes a boolean to the Label ctor to explain which the label
is being rendered for

Conflicts:
	dist/vis.js

- unified some methods in the networkUtil
- Fixed initial zoom issues #1252

Theoretically, there are multiple node shape types that this could apply to.

Will only apply to Network nodes with a shape: 'box' property, as most
other shapes this will not make sense for. This enables the box shape
to be used, for instance, for diagraming CFG data from source code.

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Fix broken link in graph2d documentation

Fixed groups.visible Description