Merge pull request #2 from mrdoob/dev

Update Dev
A simplied version of the total Reayleigh scattering to works on browsers that use ANGLE
Added note on powers-of-two for tiling images
Added note on powers-of-two for tiling images
fixed THREE.PointCloud rendering
Add touchstart event handler
Add touchstart event handler
Fix Sky Shader. Should now work on Windows and Mac (#5602)

- use simplified Rayleigh function for performance and ANGLE
- add back original in case anyone wishes to experiment wavelengths
Changed no. of segments of circle and cylinder

Line 101 : 32 segments instead of 8 as it gives the cylinder a more realistic look.
Line 123 : 32 radiusSegments instead of 8 as it gives the cylinder a more realistic look.
BloomPass: Fixed Typo. Fixes #5639.
Merge pull request #5634 from akshaynagpal/patch-1

Changed no. of segments of circle and cylinder
Menubar.Add: Removed comments.
Merge pull request #5630 from m-schuetz/fix_pc_indices

fixed THREE.PointCloud rendering
Updating path for 2.7 for OSX
Merge pull request #5642 from nickspiel/patch-2

Updating path for 2.7 for OSX
Merge remote-tracking branch 'zz85/fix_sky_shader' into dev
Oops. Fixing bad image reference
Docs: specify WebGLProgram#cameraPosition's space
Removed devicePixelRatio from renderers parameters (for simplicity).
Updated builds.