Code52/carnac — pull request #16 by shiftkey (2012-02-18 06:48:11+00:00)
Title: introduced screen manager and extracted behaviour from ShellViewModel. U...

* Introduced ScreenManager to handle P/Invoke calls and setup.
* Simplfied ShellViewModel by extracting code out of ctor.
* Added logic assembly to MEF catalog (for some reason AssemblySource.Instance only has one assembly to use).