Make EffectComposer plugins use their own camera/scene/quad

This fixes # 2951.
Update Loader.js texture double slash fix

previous was :
var fullPath = texturePath + "/" + sourceFile;
but texturePath may already have a slash (see extractUrlBase function)

changed slash to texturePath.slice(-1) === '/' : '' : '/'
Typo fix for previous commit
Add start and end events to OrbitControls

This mirrors the changes in github PR gh-4097 for Trackball controls.
Merge remote-tracking branch 'jasongrout/orbit-events' into dev
Merge remote-tracking branch 'Baccanno/patch-1' into dev
Loader: Trying to simplify the code.
Updated builds.
Removed irrelevant code.
Cleaned up avatar.dae
Removed loop parameter from Animation.play().
Animation system clean up. Fixes #4377.
Updated builds.
Added human morphtargets example to list.
Added MorphAnimation.
Fixed MorphAnimation mesh reference.
Updated builds.
More Animation related clean up.
This is a bit of a mess... :/
Updated builds.
Animation: Looping currentTime directly. Fixes issue in #4377.