Reenabled frustum culling
syncing with branch develop
Merge pull request #83 from jtorresfabra/fix_pagedlod

Reenabled frustum culling
Fixes resize code
Updates examples template
Updates more examples for the resize change
Updates even more examples for the resize change

Replaced createTextureQuad with createTextureQuadGeometry
Added a CSS rule to fix middle mouse button drag on Firefox
Added a HTML attribute on canvas to disable the context menu (right-click)
Fixes tests
Updates test of examples
Makes Leap not mandatory
Initial support for Occulus head-tracking via WebVR

Although there is no formal specification of the api yet, some Firefox and Chrome devs have published experimental builds implementing a close minimal api:
Firefox: http://blog.bitops.com/blog/2014/06/26/first-steps-for-vr-on-the-web/
Chrome: http://blog.tojicode.com/2014/07/bringing-vr-to-chrome.html
Added support for VR rendering via WebVR

The distortion is now handled by the navigator.
We only retrieve the field of view and ideal render target resolution for the current hmd and setup a double camera node.
The dualcam has been updated, you can press f on a supported navigator with an oculus and it just works.