Created PCL project, will slowly convert the main one into it. Some effort will be needed to provide back some of the missed features (mostly the configuration mapper, that is currently very platform specific).
Quick checkin before the big switcharoo
Switch made, cleanup started, tests are passing
ConfigurationMapper is back. Still need to create a NuGet package for it...
Fixed a couple of configuration unit tests
Intermediate commit, so I don't lose the Mapper precedence attribute -- it will be removed in the next commit
Removed the precedence attribute, downgraded fx for the extensions project to 4.5 instead of 4.5.1, removed some dead code.