Fixes diff calculation for transparency
typo fix
Merge pull request #24 from azproduction/patch-1

typo fix
Make canvas an optional dependency so that imagediff can be used with browserify
Add note about canvas optional dependency.
Add note to documentation for missing canvas.
Version 1.0.5

* move canvas to optional dependencies for browserify
* document missing canvas.
Merge branch 'master' of github.com:HumbleSoftware/js-imagediff
Merge pull request #19 from JoostvDoorn/master

Fixes diff calculation for transparency
Merge in top-aligned diffing.

Merge branch 'master' of github.com:cburgmer/js-imagediff into cburgmer-master

Conflicts:
	imagediff.min.js
Add diff options.top documentation.
1.0.6 release.

* Add top-aligned diffing option.
* Fix issue with diffing transparencies.