Call setCoords() only on target object

Only update target's cornerCoords.
Add support for same options in `fabric.Object#toDataURL` as there are in `fabric.Canvas#toDataURL`. Closes #609
Fix callback called 2 times, recent versions of Node call onload on the
elements
Make background white when generating data url jpeg image. Closes #613
Merge pull request #611 from xxorax/nodeOnloadFilter

Fix callback called 2 times on Node
Build distribution
Check infinity in setCoords() if object has zero width
Merge pull request #620 from Kienz/patch-1

Check infinity in setCoords() if object has zero width
Tweak docs
Fix isContainedWithinRect and isContainedWithinObject, Add fabric.Object.containsPoint
Merge pull request #621 from Kienz/selectionFix

Fix isContainedWithinRect and isContainedWithinObject - Closes #610
Add support for removing SVG export functionality during build (via no-svg-export flag)
Build distribution. Version 1.1.13
Update README.md
Merge remote-tracking branch 'origins/master' into sketch