Added frustum Culling feature
Mocked up the viewer to get working the CullVisitor in failing tests
Precreate Vec4 arrays in getFrustumPlanes function
Added the possibility to enable/disable frustum culling at node level. Unit testing added.
Added the posibility to fully disable/enable frustum culling at viewer level as an option
Fixes bounding sphere computation
Merge pull request #70 from cedricpinson/bug/bounding-sphere-computation

Fixes bounding sphere computation
Merge pull request #66 from jtorresfabra/frustum_culling

Frustum culling
Updated website to include pagedlod example
[#72032388] Adds occulus helper function inside osgjs
Removes vr.js lib
Merge pull request #72 from cedricpinson/feature/occulus-refactoring_72032388

Feature/occulus refactoring 72032388
Fixed bug in getFrustumPlanes:far plane calculation was assigning wrong the distance value. Also disable culling when the current frameNumber is 0
Merge pull request #73 from jtorresfabra/fix_frustum

Fixed bug in getFrustumPlanes:far plane calculation was assigning wrong ...
Merge pull request #71 from jtorresfabra/update_website

Updated website to include pagedlod example
Adds default template for examples
Disable frsustrum culling by default because of https://github.com/cedricpinson/osgjs/issues/74
Fixes tests
Added example composer example with stitching, vignetting and bloom examples

Also included minified dat.gui library in examples/vendor dirs
Changed the bloom brightpass method