blender lights export
Document THREE.js constants
Docs: some description for Geometry's lineDistances

Added some documentation for `geometry.lineDistances` since it wasn't very obvious apart from its usage in `examples/webgl_lines_dashed.html`.
Blender camera export fix

Export all cameras in `generate_cameras`, not just the selected one.
Merge branch 'blender-camera-export-fix' of https://github.com/joostfaassen/three.js into dev
Merge branch 'patch-1' of https://github.com/zz85/three.js into dev
Merge branch 'dev' of https://github.com/Bjvanminnen/three.js into dev
Docs: Spaces to tabs clean up.
Corrected bl_info for 2.65 exporter as well [1][2], replaced != and == by "is not" and "is" if comparing with None.

[1] https://projects.blender.org/scm/viewvc.php?view=rev&root=bf-extensions&revision=3086

[2] https://projects.blender.org/scm/viewvc.php?view=rev&root=bf-extensions&revision=4078
Update Matrix3.html

Update mat3 docs to clarify value orientation
Update Matrix4.html

Update mat4 docs to indicate value orientation
Merge branch 'dev-blender-lights' of https://github.com/fscz/three.js into dev
Blender exporter: Tabs indents in export.
Code clean up.
Yet more code clean up.
SceneLoader: Implemented @WestLangley's light target position code as per #3596.
Fixed typo.
Updated builds.
SceneLoader: Rescued lost DirectionalLight handler.
Updated builds.