Merge pull request #1 from Banbury/master

Added ability to change the Pixels To Unit size.
Merge pull request #2 from Banbury/master

Fixed atlas bug for non-power of 2 atlases.
Merge branch 'master' of https://github.com/playemgames/UnityPsdImporter

* 'master' of https://github.com/playemgames/UnityPsdImporter: