Version 2 breaking changes

Since I am planning a few breaking API changes, I have considered it best to pop up the major version number at the same time.

The following API changes are currently planned:

• Remove the prefix Set in those extension methods that are used to substitute missing property setter (issue #17).
• Replace the Shim prefix from the so-called Shim types, and use a _ suffix instead (issues #14 and #16).

The deadline for version 2.0 is not set, but it is likely to be released as soon as the above API changes and the expansion to more platform targets are completed.