Release version 2.5.0

Release version 2.4.1

Release version 2.4.0

Release version 2.3.0

Release version 2.2.0

Release version 2.1.0

Initial import of version 1.0.4 into Codeplex

Release version 2.0.0

Release version 1.6.0

The LoadPixelData refactoring turns out to have fixed a longstanding bug
in the loading of layer masks.  This is worth a bump in minor version
number.

Release version 1.5.2

The regression has been causing lots of load failures.  Time to get the
fix into the users' hands.