adding mouse down event
fixes
Merge branch 'master' of https://github.com/biasmv/pv into create-mouse-down-events
atom picked event
add rotate and single variable (zoom) animation.
add camera zoom, rotate, translate in one operation.
allow chains for fitTo
Merge branch 'chain-centre'
Merge branch 'create-mouse-down-events'

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change the initial background from white
Merge branch 'fix-original-background'

Conflicts:
	src/viewer.js
fix for selection events.
Merge branch 'create-mouse-down-events'
allow chains and residues to be passed to viewer.fitTo

Per suggestion by @Traksewt.
Merge pull request #42 from Traksewt/fix-original-background

change the initial background from white
add section of color notations to docs
use forceRGB for background color option
Merge branch 'master' of https://github.com/biasmv/pv

Conflicts:
	src/viewer.js
remove animation by default
Merge branch 'master' of https://github.com/biasmv/pv into create-mouse-down-events