Prevent highlight graphic from being exported

Due to unreliable firing of feature mouse-out events, ensure that no
feature is highlighted when the mouse exists the map area

Fixes #270
Merge pull request #271 from mmcfarland/fix/270/highlight-graphic

Prevent highlight graphic from being exported
Fix #269: Managed Area layer legend items not appearing.

As a result of fixing #255, where we removed parent node ids from the
list of visible layer ids, the map legend for nested layers fails to
render on the map export.

This change will append all parentLayerIds from visible layers to the
PrintTask template when the map is exported.
Merge pull request #272 from kdeloach/topic/issue-269

Fix #269: Managed Area layer legend items not appearing.