Merge branch 'develop', remote-tracking branch 'upstream/develop' into develop
Added PagedLOD feature, with a new quadtree example. Also added computation of the projected bounding sphere size in pixels to the Lod class.
updates readme

symlinks done in grunt now.
Update README.md
Merge pull request #60 from Kuranes/build_win_readme_update

updates readme
adds repository field to package.json

no more repository warning on npm install
(still have the -g warning on grunt...)
Merge pull request #61 from Kuranes/build_package_fix

adds repository field to package.json
Using Vec3.create() instead of manually create vectors. Changes to the class variable names to use osg notation. Using osg.Notify instead of console.log
Fixed range calculation for PagedLOD when using pixel_size_on_screen
Merge pull request #58 from jtorresfabra/plod_impl

Added PagedLOD feature, with a new quadtree example.
Merge remote-tracking branch 'upstream/develop' into develop
Fix wrong class variable name
Merge pull request #65 from jtorresfabra/fix_lod

Fix lod