Latest Release of the HoloToolkit for Unity 2017.1.1f1

(#854) Fixed UAudioManager Editor Bug and added Test Scene for UAudioManager.
(#852, #864) CameraCache utility that replaces Camera.main.
(#888, #929) Update Editor to 2017.1.1f1 for Security Update & VS 2017 15.3 compatibility.
(#874, #924) Refactored TapToPlace.
(#904) Fixed 3dText multi pass and single pass stereo rendering.
(#887, #955) Updated and refactored Editor Utilities.
(#930) Fixed mismatched Mic network stream.
(#747) Added persistent keyword capability.
- Removed obsolete warnings from scene loader.
(#927, #935) Added confidence level to keywords.
(#905, #960) Added some Enhanced 3D primitives.
(#965) Fixed IL2CPP build errors.
(#931, #967) Fixed and updated example scenes.
(#962) Fixed Quality Settings regression.
(#742) Update to WorldAnchorManager and added MultiLens capabilities.

Breaking Changes

GameObjects that utilize the WorldAnchorStore need to have unique names.
- This is important so you can spawn identical objects across the network without needing to know the anchor names ahead of time.

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