simpler and more reliable mouseX/Y (scroll aware)
Merge pull request #14 from FrenchYann/master

simpler and more reliable mouseX/Y code
Added rotation rings to unit4-euler_angles.js demo

As discussed in http://forums.udacity.com/questions/100039708/gimbal-lock
Merge pull request #15 from jotinha/master

Added rotation rings in euler angles demo, unit4
Better Euler Angle camera

Move Euler Angle camera out to see rings at start.
Add "path" for ease of local debugging

Set path at top of code to "" to use textures locally.
Properly offset grid

Use PolygonOffset so that the grid will properly be above the plane.
Make Github code match code on Udacity site
Merge pull request #16 from erich666/master

Euler fix, offset grid fix, easier texture debug
Begin cleanup of code to match online
Improved code for online exercises

part 1
Cleanup: bugs, JSHint, whitespace, etc.
Add comments, expose exercises for Unit 10
Last little cleanups
Clean out anisotropy TODOs
More whitespace and spaces to tabs
Merge pull request #17 from erich666/master

Code cleanup to match online content
Merge commit '3d2d6b186074966d4f4ae24618c5bf09751f821a'