fix typo "Concatentates".
Fix to #263: _children undefined inside call to myShape.isEmpty().
Fix typos in comments.
Merge pull request #265 from duckmaestro/master

Fix to #263: _children undefined inside call to myShape.isEmpty().
Merge pull request #262 from huochunpeng/fix_typo_in_matrix

fix typo "Concatentates".
Do not apply operator overloading in situations where UpdateExpressions happen inside other contexts that would cause a change of behavior, e.g. array[i++], or if (i++ < 1).
Closes #260.
Take Item#matrix into account when drawing gradients.

Closes #267.
Implement Raster#getSubRaster() and document both #getSubImage() and #getSubRaster().
Rename Raster#getSubImage() to #getSubCanvas(), and use insert: false combined with #insertAbove() to correctly insert newly created rasters.
Merge Raster#setImage() and #setCanvas().
Use named module AMD syntax for defining paper.

Closes #261.
Correctly detect image size on all browsers.

Closes #268.
Merge remote-tracking branch 'upstream/master'
upstream merge